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QGIS, formerly Quantum GIS, is a user friendly open source Geographic Information System (GIS) licensed under the GNU General Public License that runs on Linux, Unix, Mac OSX, and Windows and supports numerous vector, raster, and database formats and functionalities.

GRASS GIS (Geographic Resources Analysis Support System) is an open source, free software (FOSS) Geographical Information System (GIS) with raster, topological, vector, image processing, and visualization functionality. Used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization, GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies. »

OpenGeo provides support and services around GeoServer, OpenLayers, PostGIS, GeoWebCache, and GeoExt.The OpenGeo Suite brings together the OpenGeo Architecture into a single, easy-to-install integrated software package. By developing each individual component of the OpenGeo Suite individually, we ensure that the Suite integrates with existing systems—proprietary or open source. It is the fastest way to get your geospatial information on the web, leveraging the power of best-of-breed open source geospatial software. »

ArcGIS is geographic information system (GIS) software for visualizing, managing, creating, and analyzing geographic data. Using ArcGIS, you can understand the geographic context of your data, allowing you to see relationships and identify patterns in new ways.

Mapnik is a Free Toolkit for developing mapping applications. Above all Mapnik is about making beautiful maps. It is easily extensible and suitable for both desktop and web development. - C++/Python GIS toolkit

The reference implementation of the Open Geospatial Consortiums WFS and WMS services, GeoServer is a full featured open source software server written in Java that allows users to query, visualize, combine, edit and publish spatial data over the web.

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 in order to solve complex management and planning problems.

SAGA - System for Automated Geoscientific Analyses - is a Geographic Information System (GIS) software with immense capabilities for geodata processing and analysis. SAGA is programmed in the object oriented C++ language and supports the implementation of new functions with a very effective Application Programming Interface (API). Functions are organised as modules in framework independent Module Libraries and can be accessed via SAGA’s Graphical User Interface (GUI) or various scripting environments (shell scripts, Python, R, ...). »

uDig is a GIS software program produced by a community led by Canadian-based consulting company Refractions Research. It is based on the Eclipse platform and features full layered open source GIS. It is written in Java and released under GNU Lesser General Public License.

Mapline is the simplest mapping software on the planet! Be empowered with map visualizations from Excel spreadsheet data to optimize logistics, enhance market planning, identify growth opportunities, or mitigate market risks. Create your first map now!

GeoNode is a web-based application and platform for developing geospatial information systems (GIS) and for deploying spatial data infrastructures (SDI).

MapWindow is a fully free and open source geographic information system project. It includes an open source programming component, MapWinGIS ActiveX, and an extensible desktop application that supports plug-ins written in .NET (C# and VB.NET). The most recent effort, MapWindow 6, includes a fully C# programming library that is intended to serve as an alternative to ESRIs ArcObjects platform.

Map Business Online, America's fastest growing online mapping software, offers sales territory management, business data visualization, and multi-stop optimized routing tools for business professionals. The most affordable and powerful mapping software available today.

MapInfo Professional is a powerful, functionally rich desktop mapping application from Pitney Bowes MapInfo, designed to enable organisations to solve business problems that have a geographical element.

Manifold GIS is a combination of mapping, CAD, DBMS and image processing. The hallmark of GIS is the power of using a visual interface to view, grab, analyze, manipulate and transform data that would not be comprehensible in classic row and column DBMS text presentations. Although many people use Manifold to create brilliant and compelling maps for presentations, the unique power of Manifold comes from the visual computing it makes possible with databases ranging from personal data to the largest, most sophisticated, enterprise-class databases. At far less than the price of a limited mapping tool like Google Earth Pro, Manifold delivers far more capability. »