Cross platform (lin/win/mac) geographical information system (GIS)
GeoServer repository
Large-scale WebGL-powered geospatial data visualization analysis
Open OSINT stack for monitoring, analysis, and risk detection
Open Source Desktop GIS with Surveying and Cartography Functionality
Automated detection of the unknown early map projection
Plugins for OpenCPN
A small nifty program where you build you own ZOO
GeoData Web Editing [core SIG Web]
Automate merging / importing of country data from different sources