Cross platform (lin/win/mac) geographical information system (GIS)
GeoServer repository
Viking is a free/open source program to manage GPS data
Toolkit for working with and mapping geospatial data
Visualize deep ocean biogeochemical sediment samples in 2D and 3D!
Plugins for OpenCPN
GeoData Web Editing [core SIG Web]
Distributed Version Control System for Geospatial data
Geospatial Distributed Version Control System