You said anything...so I thought I would see what happens when I share all the links from this Open Source GIS Tool website.  This is information that helps my project team work on our upcoming projects.  Enjoy!  

Open Source GIS

[Last update: 12/8/2013 - About 350 projects listed.]

This effort represents an attempt to build a complete index of Open Source / Free GIS related software projects. In addition to those alphabetized here, many great projects are listed at the end and will be integrated soon. And this will all move to a proper database. The definition of GIS is kept loose to encompass a broad range of projects which deal with spatial technology.

If you know of other efforts that should be listed please tell me about them. More importantly if I have made any errors in characterizing a project, let me know: bglewis<at>gmail.com.

This effort stands on the sturdy shoulders of other projects, most notably OSGeo , FreeGIS.org, and freecode.

Descriptive text gathered from the project site is in quotes. Almost all of these projects fit the definition of Open Source Software as defined by the Open Source Initiative, and most of them fit the stricter definition of Free Software as defined by the Free Software Foundation.

AVCE00 "AVCE00 is an Open Source (i.e. Free!) ANSI-C library that makes Arc/Info (binary) Vector Coverages appear as E00! It allows you to read and write binary coverages just as if they were E00 files." [ License: ? ]

BASINS "BASINS Version 4.0 is an open source GIS that integrates environmental data, analysis tools, and modeling systems." [ License: ? ]

Batik "Batik is a Java(tm) technology based toolkit for applications or applets that want to use images in the Scalable Vector Graphics (SVG) format for various purposes, such as viewing, generation or manipulation." [License: Apache Batik ]

BBBike "BBBike is an information system for cyclists in Berlin and Brandenburg (Germany). The application has the following features: 1) Display a map with streets, railways, rivers, parks, altitude and other features. 2) Find and show routes between two points. The route-finder can be customized to match the cyclists preferences (fastest or nicest route, keep wind direction and hills into account etc.). 3) A bike power calculator. 4) Automatically fetch current Berlin weather data." [ License: GNU General Public License (GPL) ]

BLM GIS Utilities "Bureau of Land Management's FTP site of GIS utilities" [ License: Public Domain ]

BRL CADl "The BRL-CAD Package is a powerful Constructive Solid Geometry (CSG) solid modeling system." [ License: ? ]

BuddySpace "BuddySpace is an instant messenger with four novel twists: (1) it allows optional maps for geographical & office-plan visualizations in addition to standard 'buddy lists'; (2) it is built on open source Jabber, which makes it interoperable with ICQ, MSN, Yahoo and others; (3) it is implemented in Java, so it is cross-platform; (4) it is built by a UK research lab, so it is 100% free with full sources readily available. [ License: Academic Free License (AFL), Jabber License ]

Bundler "Bundler is a structure-from-motion (SfM) system for unordered image collections (for instance, images from the Internet) written in C and C++. Bundler takes a set of images, image features, and image matches as input, and produces a 3D reconstruction of camera and (sparse) scene geometry as output." [ License: ? ]

CartoDB "CartoDB is an open source tool that allows for the storage and visualization of geospatial data on the web. It was built to make it easier for people to tell their stories by providing them with flexible and intuitive ways to create maps and design geospatial applications."

Cartaro "Cartaro is the web mapping platform that brings the power of the best open source geospatial components into a content management system." [ License: ? ]

CAVOR "CAVOR is an engine for building apps that involve both graphic and text/numeric data. Primarily GIS is the initial focus, but consider also CAD, CASE, project management (eg PERT charts), and others. Built-in scripting, C API, also supports Tcl and Java." [ License: GNU Lesser General Public License (LGPL) and Commercial or GNU General Public License (GPL)]

CGAL "The goal of the CGAL Open Source Project is to provide easy access to efficient and reliable geometric algorithms in the form of a C++ library." [ License: GNU Lesser General Public License (LGPL) and Commercial ]

Census Data Conversion "Dr. Bruce Ralston has developed a number of software programs to make extracting and mapping of Census data as easy and inexpensive as possible. These programs are designed to work with a number of current and legacy data products produced by the US Census and other agencies." [License:?]

Cesium "Cesium is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin. It uses WebGL for hardware-accelerated graphics, and is cross-platform, cross-browser, and tuned for dynamic-data visualization. [ License: Apache 2.0 ]

cgList "This page contains a list of computational geometry programs and packages." [ License: Varies ]

Chameleon "Chameleon technology represents a revolutionary advancement in Web mapping technology. It has been developed by DM Solutions with the goal of producing a highly customizable and adaptable environment for deploying and managing Web mapping applications." [ License: DM Solutions License ]

CityTracking "...CityTracking is intended to be a public, open source project that takes data about cities and lays it open for examining from many angles so it can be optimized for use by city personnel, journalists, and the public (including businesses). Along the way we’ll release server-side code bases, mapping algorithms, managed datasets, APIs and API specs, and new views on data." Software: https://github.com/Citytracking/ [License:?]

Cocoon ArcIMS "This page documents implementing a wrapper over ArcIMS using Apache Cocoon." [ License: ? ]

Collective.geo "The goal is to provide a comprehensive set of tools to manage and publish geospatial data in the Plone CMS, using existing and proven technologies as much as possible." [ License: ? ]

Community Mapbuilder "Our mission is to empower communities to collaboratively build and share geographic data using standards-based, open source tools. We develop mapbuilder-lib, an open source library of browser based mapping widgets." [ License: GNU Lesser General Public License (LGPL) ]

D3.js "a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG and CSS." [ License: ? ]

DCMMS "A web-based maintenance management system for water and waste water networks. Allows to store customer complaints and issue workorder sheets. Rather than using street names, maps and landmarks are used for navigation." Uses PostGIS. [ License: GNU General Public License (GPL) ]

Deegree "Deegree is open source software for spatial data infrastructures and the geospatial web. Deegree includes components for geospatial data management, including data access, visualization, discovery and security." [ License: GNU Lesser General Public License (LGPL) ]

Demeter Terrain Engine "Demeter is a cross-platform C++ library that renders 3D terrains using OpenGL. Demeter is designed for fast performance and good visual quality and makes use of advanced techniques such as dynamic tessellation (adaptive mesh) to render vast landscapes in real-time, without the need for high-end hardware. It is written as a stand-alone component that can be easily integrated into any kind of application." [ License: GNU Lesser General Public License (LGPL) ]

DEM Tools "Python code for working with Digital Elevation Models and tile rendering." [ License: custom license ]

DGNLib "Microstation DGN reading library portable and callable from C/C++. " [ License: MIT ]

dlgvu "dlgvu is an interactive Digital Line Graph (DLG) viewer for Unix, written in the Icon programming language." [ License: Public Domain ]

DNRGPS Converts GPX, CSV, and KML files to shape. "DNRGPS is an update to the popular DNRGarmin application. DNRGPS and its predecessor were built to transfer data between Garmin handheld GPS receivers and GIS software." [ License: ?]

EDBS "This page is about the german topographic data transfer standard EDBS/ATKIS and a reader for this format. Owing to the specific nature of this data format, the following information is exclusively available in German." [ License: GNU General Public License (GPL) ]

E-FOTO “This project, called E-FOTO, aims to develop and manage an educational photogrammetric softcopy kit. It is based on two main principles: the total freedom of the software under development and the self-teaching approach.” [ License: ?]

Engineering Portal Open Source engineering applications. [ License: ? ]

FlightGear "FlightGear is an open-source flight simulator. It supports a variety of popular platforms (Windows, Mac, Linux, etc.) and is developed by skilled volunteers from around the world." [ License: GNU General Public License (GPL) ]

FreeType "Is written in C, designed to be small, efficient, highly customizable, and portable while capable of producing high-quality output (glyph images) of most vector and bitmap font formats." [ License: FreeType or GNU ]

FMaps "FMaps is here to answer the lack of user friendly opensource GIS/RS (Geographic Information System/ Remote Sensing) application on the Linux and Gnome compatible platforms. " [ License: GNU General Public License (GPL) ]

FREEDraft "FREEdraft is a project to create a simple 2D mechanical CAD system." This project is no longer under development. [ License:GNU General Public License (GPL) ]

FWTools "FWTools is a set of Open Source GIS binaries for Windows (win32) and Linux (x86) systems. It was previously known as OpenEV_FW. The kits are intended to be easy for end users to install and get going with. No fudzing with building from source, or having to collect lots of interrelated packages. FWTools includes OpenEV, GDAL, MapServer, PROJ.4 and OGDI as well as some supporting components. [ License: Various Open Source ]

GARNIX "GARNIX is a communication program that provides a data interface between an MS-DOS computer and a GARMIN GPS device." [ License: GNU General Public License (GPL) ]

GD "GD is an open source code library for the dynamic creation of images by programmers. GD is written in C, and "wrappers" are available for Perl, PHP and other languages. " [ License: GD License ]

GDV Mapserver Client Mapserver web client written in Javascript. [ License: GNU Lesser General Public License (LGPL) ]

GDAL/OGR "GDAL is a translator library for raster geospatial data formats that is released under an Open Source license. As a library, it presents a single abstract data model to the calling application for all supported formats." [ License: MIT]

General Cartographic Transformation Package - Fortran "The General Cartographic Transformation Package (GCTP) is a system of software routines designed to permit the transformation of coordinate pairs from one map projection to another." [ License: ? ]

GEO "GEO is a scriptable coordinate conversion tool." [ License: GNU General Public License (GPL) ]

GeoAPI "GeoAPI provides a set of Java language programming interfaces for geospatial applications." [ License: ? ]

Geocoder "This is the submission that won the 2002 Google Programming Contest. It includes a geocoder (which uses TIGER/Line data to turn street addresses into latitude/longitude coordinates), a simple indexer that looks for addresses and keywords in documents, and a query engine to search for documents matching certain keywords that also contain addresses within a certain distance of a target location." [ License: GPL and Google ]

geocoder.us "Geocoder.us is a public service providing free geocoding of addresses and intersections in the United States. The geocoding service relies on Geo::Coder::US, a Perl module available for download from the CPAN. [ License: GNU General Public License (GPL) ]

GeoCommunity - Translators Page GeoComm's collection of translator utilities. [ License: Varies ]

GEODAS "GEODAS (GEOphysical DAata System) is an interactive database management system developed by the National Geophysical Data Center (NGDC) for use in the assimilation, storage and retrieval of geophysical data." [ License: free for noncommercial use ]

GeoJasPer "GeoJasPer is a free and open source Geo supporting command line transcoder between JPEG2000 and other formats. i.e. Converts image data from one format to another correctly transferring Geo information between GeoTiff and GeoJp2™ (GeoJpeg2000). [ License: ? ]

GeoKettle "GeoKettle is a powerful, metadata-driven Spatial ETL tool dedicated to the integration of different spatial data sources for building and updating geospatial data warehouses." [ License: GNU Lesser General Public License (LGPL) ]

GeoMajas "Geomajas is an enterprise-ready open sourceGIS framework for the web. It has client-server integration for displaying and editing of geographic data. Geomajas has integrated security and is endlessly scalable." [ License: GNU General Public License (GPL) ]

Geometry Utility Library "GUL is a library of C++ functions. It mainly contains basic functions for tesselating and manipulating NURBS curves and surfaces, as well as functions for interpolating and approximating data points with NURBS curves and surfaces. It also contains some functions related to Computational Geometry, like triangulating general polygons, intersection of 2D polygons, kd-tree, exact arithmetic and other useful stuff." [ License: ? ]

GeoNetwork OpenSource "GeoNetwork is a catalog application to manage spatially referenced resources. It provides powerful metadata editing and search functions as well as an embedded interactive web map viewer. It is currently used in numerous Spatial Data Infrastructure initiatives across the world." [ License: GNU Lesser General Public License (LGPL) ]

GeOxygene "A Spatial data GeOxygene aims at providing an open framework which implements OGC/ISO specifications for the development and deployment of geographic (GIS) applications. It is a open source contribution of the COGIT laboratory at the IGN (Institut Géographique National), the French National Mapping Agency. GeOxygene is based on Java and open source technologies and provides users with an extensible object data model (geographic features, geometry, topology and metadata) which implements OGC specifications and ISO standards in the geographic information domain. The support of the Java interfaces developed by the open source GeoAPI project is planned." [ License: GNU Lesser General Public License (LGPL) ]

GeoRuby "GeoRuby provides geometric data types from the OGC "Simple Features for SQL" specification. A plugin for Rails which manages PostGIS geometric columns in a transparent way is also provided. [ License: MIT ]

GEOS "GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS). As such, it aims to contain the complete functionality of JTS in C++. This includes all the OpenGIS "Simple Features for SQL" spatial predicate functions and spatial operators, as well as specific JTS topology functions." [ License: GNU Lesser General Public License (LGPL) ]

GeoServer"GeoServer is an open source software server written in Java that allows users to share and edit geospatial data. Designed for interoperability, it publishes data from any major spatial data source using open standards." [ License: GNU General Public License (GPL) ]

GeoToad "GeoToad is a tool for serious geocachers. It lets you make advanced queries to find the perfect caches to hit on your day out, and export them to any imaginable format." [ License: ? ]

GeoTools "GeoTools is an open source (LGPL) Java code library which provides standards compliant methods for the manipulation of geospatial data, for example to implement Geographic Information Systems (GIS). The GeoTools library implements Open Geospatial Consortium (OGC) specifications as they are developed." [ License: GNU General Public License (GPL) ]

GeoTrellis "GeoTrellis is an open source geographic data processing engine for high performance applications."
[ License: Apache 2.0 ]

Geotools.Net "Geotools.Net is a set of .net class useful when handling geographic information. The project started as port from Java to C# of JTS 1.2." [ License: GNU Lesser General Public License (LGPL) ]

GeoVista Studio "GeoVISTA Studio is an open software development environment designed for geospatial data. Studio is a programming-free environment that allows users to quickly build applications for geocomputation and geographic visualization." [ License: GNU Lesser General Public License (LGPL) ]

GFC "GFC, or Geographic Foundation Class library, is a set of C++ classes defining basic geographic data types, including points, lines, rectangles, circles, polylines, rings, complex polygons, rasters, and other atomic data types such as integer, real, varchar. GFC also features abstractions of timestamps and time series which are useful in capturing the dynamics of spatiotemporal data." [ License: ? ]

Ghostscript "An interpreter for the PostScript language and for PDF, and related software and documentation." [ License: GNU General Public License (GPL) ]

GIServer “GIServer is a project based GeoTools. It is implementing functions as same as ArcGIS Server (10) REST interface, developers with ArcGIS Flex/JS/Silverlight API experience will have a free/open-source ArcGIS-liked server to use.” [ License: ? ]

GIS Knoppix"GIS-Knoppix is a bootable Linux CD with pre-installed GIS software.
It is based on Knoppix." [ License: varies]

GISToolKit "The GISToolkit software is an open source java toolkit for building spatially enabled applications. It has some ability to read data from a variety of data sources, and to display that information to the user." [ License: GNU Lesser General Public License (LGPL) ]

GIMP "The GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software suitable for such tasks as photo retouching, image composition and image authoring." [ License: GNU General Public License (GPL) ]

GMT "GMT is an open source collection of ~65 tools for manipulating geographic and Cartesian data sets (including filtering, trend fitting, gridding, projecting, etc.) and producing Encapsulated PostScript File (EPS) illustrations ranging from simple x-y plots via contour maps to artificially illuminated surfaces and 3-D perspective views; the GMT supplements add another ~70 more specialized tools. " [ License: GNU General Public License (GPL) ]

GML4J "GML4J is a Java API for facilitating work with the Geography Markup Language (http://www.gmlcentral.com). GML is an XML-based framework for encoding geography information adopted as a recommendation paper by OGC (http://www.opengis.org)." [ License: Apache Software License]

Gnuplot "Gnuplot is a portable command-line driven graphing utility for Linux, OS/2, MS Windows, OSX, VMS, and many other platforms. The source code is copyrighted but freely distributed (i.e., you don't have to pay for it). It was originally created to allow scientists and students to visualize mathematical functions and data interactively, but has grown to support many non-interactive uses such as web scripting." [ License: GNU General Public License (GPL) ]

GPC " The University of Manchester General Polygon Clipper (GPC) library is a flexible and highly robust polygon set operations library for use with C, C#, Delphi, Java, Perl, Python, Haskell, Lua, VB.Net (and other) applications." [ License: ?]

GPSBabel "GPSBabel converts waypoints, tracks, and routes between popular GPS receivers and mapping programs. It also has powerful manipulation tools for such data." [ License: GNU General Public License (GPL) ]

GpsDrive "Gpsdrive is a car (bike, ship, plane) navigation system. Displaying your position on a map and a lot of other functions are implemented. It works with vector maps from http://www.OpenStreetMap.de/." [ License: GNU General Public License (GPL) ]

GPSMan "GPS Manager (GPSMan) is a graphical manager of GPS data that makes possible the preparation, inspection and edition of GPS data in a friendly environment. GPSMan supports communication and real-time logging with both Garmin, Lowrance and Magellan receivers and accepts real-time logging information in NMEA 0183 from any GPS receiver." [ License: GNU General Public License (GPL) ]

GPStrans GPStrans is a program which allows track, route, and waypoint data to be transferred to and from a Garmin GPS. [ License: GNU General Public License (GPL) ]

GPSTk "The goal of the GPSTk project is to provide an open source library and suite of applications to the satellite navigation community--to free researchers to focus on research, not lower level coding." [ License: GNU General Public License (GPL) ]

Grace "Grace is a WYSIWYG 2D plotting tool for the X Window System and M*tif." [ License: GNU General Public License (GPL) ]

GrADS "The Grid Analysis and Display System (Grads) is an interactive desktop tool that is used for easy access, manipulation, and visualization of earth science data. Grads has been implemented worldwide on a variety of commonly used operating systems and is freely distributed over the Internet." [ License: Grads License ]

GRASS Official Page "GRASS GIS, commonly referred to as GRASS (Geographic Resources Analysis Support System), is a free Geographic Information System (GIS) software used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization." Runs on Windows, OSX, and Linux. [ License: GNU General Public License (GPL) ]

GRASSLinks "GRASSLinks is a World Wide Web interface to a geographic information system (GIS), offering public access to mapped information. GRASSLinks provides GIS display and analysis tools to facilitate data sharing and cooperation between environmental planning agencies, public action groups, citizens, and private entities. " [ License: ? ]

GSLIB "GSLIB is an acronym for Geostatistical Software LIBrary. This name was originally used for a collection of geostatistical programs developed at Stanford University over the last 15 years." [ License: ? ]

Gstat "Gstat is an open source (GPL) computer code for multivariable geostatistical modelling, prediction and simulation, and has been around from 1997." [ License: GNU General Public License (GPL) ]

GTS Library "GTS stands for the GNU Triangulated Surface Library. It is an Open Source Free Software Library intended to provide a set of useful functions to deal with 3D surfaces meshed with interconnected triangles. " [ License: GNU Lesser General Public License (LGPL) ]

gvSIG Desktop "gvSIG is a Geographic Information System (GIS), that is, a desktop application designed for capturing, storing, handling, analyzing and deploying any kind of referenced geographic information..." [ License: GNU General Public License (GPL) ]

gvSIG Mobile "gvSIG Mobile is a Geographic Information System (GIS) aimed at mobile devices, ideal for projects that capture and update data in the field." [ License: GNU General Public License (GPL) ]

Hierarchical Triangular Mesh "The Hierarchical Triangular Mesh is a multi level, recursive decomposition of the sphere." [License: ? ]

HUGO "Hugo is a GPS-capable moving map program previously distributed as MayKo Xmap. It supports GeoTIFF, TIFF, BSB ChartKit, raster, and vector format maps. [ License: Q Public License ]

HidroSIG "HidroSIG is a Geographical Information System (GIS) with special tools that will allow one to make estimations and analysis of hydrological, climatic and geomorphological variables. " [ License: GNU Lesser General Public License (LGPL) ]

iGeoPortal "iGeoPortal is the web-based portal framework of deegree. deegree is a Java Framework offering the main building blocks for Spatial Data Infrastructures (SDIs). Its entire architecture is developed using standards of the Open Geospatial Consortium (OGC) and ISO Technical Committee 211" [ License: GNU Lesser General Public License (LGPL) ]

iGMT "iGMT provides a graphical user interface for GMT and is written in the Tcl/Tk computer language." [ License: GNU General Public License (GPL) ]

ImageJ "ImageJ is a public domain Java image processing program inspired by NIH Image for the Macintosh." [License: Public Domain ]

ImageMagick "ImageMagick is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF." [ License: Apache 2.0 ]

InetAddressLocator "Not your grandmother's geolocator! The fastest, most accurate IP geolocation system in the universe. Built by professionals. Freely distributed." [ License: GNU General Public License (GPL) ]

Intergraph WMS Viewer "The Intergraph WMS Viewer facilitates collaboration of geospatial information stored in WMS sources." [ License: Intergraph Viewer License ]

IRIT IRIT is a solid modeling environment that allows one to model basic, primitive based, models using Boolean operations as well as freeform surface's based models. [License: ? ]

IVICS “IVICS was developed as a visualization tool to facilitate selection of training samples from satellite images. It has evolved into a general purpose visualization system which supports several common satellite and remote sensing data formats.” [ License: GNU General Public License (GPL) ]

ivtools "Ivtools is a suite of free X Windows drawing editors for PostScript, TeX, and web graphics production, as well as an embeddable and extendable vector graphic shell." [License: ?]

JasPer "The JasPer Project is an open-source initiative to provide a free software-based reference implementation of the codec specified in the JPEG-2000 Part-1 standard (i.e., ISO/IEC 15444-1)." [License: ?]

Java3D DEM Viewer "3d visualization of USGS Digital Elevation Models (DEM). Support for stereo visualization. Written in Java and Java3D" [ License: GNU General Public License (GPL) ]

jGridShift jGridShift is a small piece of software for NTv2 transformation. It is written in Java and includes a J2EE Connector Architecture (JCA) adapter. There is a sample GUI tool and a sample web service. [ License: GNU Lesser General Public License (LGPL) ]

JCS "The JCS Conflation Suite is an API and set of interactive tools which perform conflation on spatial datasets." [License: ?]

JTS “The Java Topology Suite is a Java API of 2D spatial predicates and functions.” [ License: GNU Lesser General Public License (LGPL) ]

JUMP "The Java Unified Mapping Platform (JUMP) is a GUI-based application for viewing and processing spatial data. It includes many common spatial and GIS functions. It is also designed to be a highly extensible framework for developing and running custom spatial data processing applications." [License: ?]

KFLog "The KFLog-Family is a suite of free OpenSource programs aimed at flight planning and flight analysis for gliders. [License: ?]

KIDS "The Key Indicator Data System (KIDS) has been developed by the World Agriculture Information Centre (WAICENT) of the Food and Agriculture Organization of the United Nations. KIDS is a software framework that provides the ability to implement thematic information systems that collect, reference, visualize, exchange and disseminate statistical, survey and indicator data. KIDS was developed originally for the purpose of collecting, mapping and disseminating food insecurity and vulnerability indicators that are relevant to Food Insecurity and Vulnerability Information and Mapping System (FIVIMS)." [License: ?]

kvwmap "kvwmap is a complex WebGIS client and server solution for eGovernment purposes written in PHP using UMN Mapserver technologie, MySQL and PostgreSQL/PostGIS databases, SVG, etc." [ License: GNU General Public License (GPL) ]

Leaflet "Leaflet is a modern open-source JavaScript library for mobile-friendly interactive maps. Leaflet is designed with simplicity, performance and usability in mind. It works efficiently across all major desktop and mobile platforms out of the box, taking advantage of HTML5 and CSS3 on modern browsers while still being accessible on older ones." [License: ?]

Libgeotiff "Libgeotiff is a public domain library normally hosted on top of libtiff for reading, and writing GeoTIFF information tags." [License: Public Domain ]

libGRASS “The libgrass package consists of the majority of the GRASS libgis, and libdatetime library build as a standalone shared library suitable for use by non-GRASS applications wishing to read and write GRASS databases. Some additional functions have been added to simplify library initialization and data access by non-GRASS applications.” [ License: MIT ]

Libvm http://code.google.com/p/libmv/ "libmv is a structure from motion library, which plans to one day take raw video footage or photographs, and produce full camera calibration information and dense 3D models." [ License: MIT ]

libtiff "The library, along with associated tool programs, should handle most of your needs for reading and writing TIFF images on 32- and 64-bit machines. This software can also be used on older 16-bit systems though it may require some effort and you may need to leave out some of the compression support. " [ License: Libtiff License ]

*LightRod "...the need arose for an open source geographic search engine, or proximity search...the software is scalable to any number of records, and uses 'peano codes', or space filling curves to find the nearest results, no matter what distance they are from the request." [License: ?]

Locast "Open Locast enables rapid deployment of location-based media platforms." [License: ?]

Lx-Viewer "LX-Viewer is a program that will allow you to open, view, print and convert DWG or DXF files, typically used in AutoCAD related technical drafting.” [ License: modified version of the GPL ]

Majas "MAJAS is a component framework for building rich Internet applications (RIA) with sophisticated capabilities for the display, analysis and management of geographic information." [ License: GNU General Public License, Version 2 ]

Mapbender3 "Mapbender is the back office software and client framework for spatial data infrastructures. The software is implemented in PHP und JavaScript and dual licensed under GNU GPL and Simplified BSD license. It provides a data model and web based interfaces for displaying, navigating and interacting with OGC compliant map services." [ License: GNU Lesser General Public License (LGPL) ]

MapBox "MapBox Streets is a highly accurate worldwide map powered by up-to-the-minute data from the OpenStreetMap project. It's built to be customized: change the map colors, show and hide features, and even configure the labeling language to make it yours." [License: ?]

Maphub Platform for georeferencing and annotating scanned maps. [License: ?]

MapKnitter "Learn to turn aerial images into maps with the Public laboratory's open source MapKnitter.org tool."
[License: ?]

MapIgniter "MapIgniter is a web mapping application that allows publishing and visualization of geographic information in an internet browser." [License: ?]

MapLab “MapLab is a suite of effective and intuitive web-based tools to create and manage MapServer web mapping applications and map files. It consists of three components: MapEdit, MapBrowser and GMapFactory.” [ License: DM Solutions ]

mapnik "Mapnik is a Free Toolkit for developing mapping applications. Above all Mapnik is about making beautiful maps." [ License: GNU General Public License (GPL) ]

MapServer "MapServer is an Open Source platform for publishing spatial data and interactive mapping applications to the web." [ License: MapServer License ]

Map Guide Open Source "MapGuide Open Source is a web-based platform that enables users to quickly develop and deploy web mapping applications and geospatial web services." [ License: GNU Lesser General Public License (LGPL) ]

MapServer Workbench "A set of cooperative tools for development of MapServer web mapping applications." [ License: ? ]

Mapwarper "Mapwarper is an open source map geo-rectification, warping and georeferencing application. It enables a user to upload an image, a scanned map or aerial photo for example, and by placing control points on a reference map and the image, to warp it, to stretch it to fit." [ License: ? ]

MapWindow "The MapWindow GIS project includes a free and open source desktop geographic information system (GIS) with an extensible plugin architecture; a GIS ActiveX control; and C# GIS programmer library called DotSpatial." [License: Mozilla Public Licence 1.1]

Mapyrus "Mapyrus is software for creating plots of points, lines, polygons and labels to PostScript (high resolution, up to A0 paper size), Portable Document Format (PDF), Scalable Vector Graphics (SVG) format and web image output formats." [ License: GNU General Public License (GPL) ]

MB-System "MB-System is an open source software package for the processing and display of bathymetry and backscatter imagery data derived from multibeam, interferometry, and sidescan sonars." [ License: ? ]

*Mesa "Mesa is an open-source implementation of the OpenGL specification - a system for rendering interactive 3D graphics. " [ License: ? ]

MetaPost "MetaPost is a powerful language for producing figures for documents to be printed on PostScript printers, either directly or embedded in (La)TeX documents." [ License: Public Domain ]

mezoGIS "mezoGIS is a GIS application, a graphical interface to query and analyse spatial data. mezoGIS does not store or compute data directly, but operates external PostGIS databases." [ License: GNU General Public License (GPL) ]

modestMaps "Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects. It provides a core set of features in a tight, clean package with plenty of hooks for additional functionality." [ License: ? ]

Mozilla SVG "Scalable Vector Graphics (SVG) is an XML markup language for describing two-dimensional vector graphics. SVG is essentially to graphics what XHTML is to text." [License: Mozilla Public License ]

MySQL Spatial "MySQL supports spatial extensions to enable the generation, storage, and analysis of geographic features. " [ License: GNU General Public License (GPL) ]

NASA Common Data Format "Self-describing data format for the storage of scalar and multidimensional data in a platform- and discipline-independent way. Scientific data management package (CDF Library) allows application developers to manage these data arrays. Transparent access to data and metadata through Application Programming Interfaces (APIs)." Software http://cdaweb.gsfc.nasa.gov/pub/software/cdf/dist/. [ License: Public Domain ]

NCAR Graphics "NCAR Graphics is a Fortran and C based software package for scientific visualization." [ License: GNU General Public License (GPL) ]

NetTopologySuite "The main goal of this project is to have a .NET GIS solution that is fast and reliable for the .NET platform. NetTopologySuite is a direct-port of all the functionalities offered by JTS Topology Suite." [ License: GNU Lesser General Public License (LGPL) ]

NRDB "NRDB is a free database and mapping application for developing and distributing environmental databases. It was designed to provide people in developing countries with a powerful yet simple tool to assist in the managing of their own resources. " [ License: GNU General Public License (GPL) ]

NTXshape "NTXShape converts files from the CARIS NTX format into the widely supported ESRI shapefile format." [ License: ? ]

Nunaliit "The Nunaliit Atlas Framework aims to make it easy to tell stories and highlight relationships between many different forms of information from a variety of sources, using maps as a central way to connect and interact with the data." [ License: New BSD License ]

ODK Geoserver "An exercise in open source mobile GIS data collection." [ License: ? ]

OGCServer "Python WMS implementation using Mapnik."

OGDI “OGDI is the Open Geographic Datastore Interface. OGDI is an application programming interface (API) that uses a standardized access methods to work in conjunction with GIS software packages (the application) and various geospatial data products. ” [ License: MIT ]

OGLE "OGLE (OpenGLExtractor) is software package by Eyebeam R&D that allows for the capture and re-use of 3D geometry data from 3D graphics applications on Microsoft Windows." [ License: GNU General Public License (GPL) ]

Open 3D GIS "A Open Source project with the main goal to make a simple way to display 3D objects from a Geodatabase (PostgreSQL/PostGIS) on the Web." [ License: ? ]

Open CASCADE "Open CASCADE Technology is a software development platform freely available in open source. It includes C++ components for 3D surface and solid modeling, visualization, data exchange and rapid application development." [ License: OpenCascade ]

OpenCV "OpenCV (Open Source Computer Vision) is a library of programming functions for real time computer vision. " [ License: BSD ]

OpenDMTP "The "Open Device Monitoring and Tracking Protocol", otherwise known as OpenDMTP™, is a protocol and framework that allows bi-directional data communications between servers and devices (clients) over the Internet and similar networks. OpenDMTP is particularly geared towards Location-based information (LBS) such as GPS, as well as temperature and other data collected in remote-monitoring devices. OpenDMTP is small, and is especially suited for micro-devices such as PDA's, mobile phones, and custom OEM devices." [License: Apache Software License, version 2 ]

OpenDX "OpenDX is a uniquely powerful, full-featured software package for the visualization of scientific, engineering and analytical data." [ License: IBM Public License ]

OpenEV "OpenEV is a library, and reference application for viewing and analyzing raster and vector geospatial data." [ License: GNU Lesser General Public License (LGPL) ]

OpenGeoportal "The Open Geoportal (OGP) is a collaboratively developed, open source, federated web application to rapidly discover, preview, and retrieve geospatial data from multiple organizations." [ License: ? ]

OpenLayers "OpenLayers makes it easy to put a dynamic map in any web page. It can display map tiles and markers loaded from any source." [ License: ? ]

OpenMap "BBN Technologies' OpenMap package is a JavaBeans based programmer's toolkit. Using OpenMap, you can quickly build applications and applets that access data from legacy databases and applications.