Viking is a free/open source program to manage GPS data
Toolkit for working with and mapping geospatial data
Geographic library
GPS track editor for editing tracks and planning (multiple) day tours
Open source cross-platform Java Visual Traceroute
GWC is a tile server and caching proxy written in Java
A cartography program with parameter adjustments and gravity fonctions
Free software for maps
Tool for assessment of environmental services on farm scale.
NMEA 0183 library for Java
Set of Java interfaces for geospatial applications
Tool to work on map data, to check the data and generate your own maps
Offline vector map display ported from OsmAnd