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GDF Hannover (Gesellschaft für Datenanalyse und Fernerkundung) offers solutions for spatial data analysis and remote sensing. As an innovative and competent consulting company, they focus particularly on the development of new methods of geo data analysis. Their special fields of work are remote sensing (aerial photointerpretation and satellite remote sensing) and data modeling as well as GIS training courses.

Here you can order updated manuals both in English and German for GRASS GIS.

Quantum GIS (QGIS) is a Geographic Information System (GIS) built for Linux/Unix, that works also on Windows and MacOS X. QGIS supports vector, raster, and database formats. QGIS is licensed under the GNU Public License.

Some of the major features include:

1. Support for spatially enabled PostGIS tables
2. Support for shapefiles, ArcInfo coverages, Mapinfo, and other formats supported by OGR
3. Raster support for a large number of formats
4. Identify features
5. Display attribute tables
6. Select features
7. GRASS Digitizing
8. Feature labeling

Gstat is an open source (GPL) computer code for multivariable geostatistical modelling, prediction and simulation, and has been around from 1997. In the original form, gstat is a stand-alone executable, interfaced to various GIS. As of 2003, the gstat functionaly is also available as an S extension, either as R package or S-Plus library. Current development mainly focuses on the S extension. The reason for this is obvious for those familiar with R and/or S-Plus.

This site hosts and supports various open source software projects related to remote sensing, GIS, mapping and advanced image processing.

MapServer is an OpenSource development environment for constructing spatially enabled Internet-web applications. The software builds upon other popular OpenSource or freeware systems including Shapelib, FreeType, Proj.4, GDAL/OGR. MapServer will run where most commercial systems won't or can't, on Linux/Apache platforms. MapServer is known to compile on most versions of UNIX/Linux, Microsoft Windows and even MacOS.

GRASS GIS (Geographic Resources Analysis Support System) is an open source, Free Software Geographical Information System (GIS) with raster, topological vector, image processing, and graphics production functionality that operates on various platforms.