- General Purpose Programming with Scripting Languages
- Graphviz
- LaTeX Tips and Tricks
- PostGIS: Spatially enabled Relational Database Sytem
- PROJ: forward and reverse geographic projections
- GDAL and OGR: geodata conversion and re-projection tools
- R: advanced statistical package
- GRASS GIS: raster, vector, and imagery analysis
- Generic Mapping Tools: high quality map production
- TAPESG: Grid-based Terrain Analysis Software
- Classification with Weka
