Deegree
Deegree
http://deegree.sourceforge.net/
FreeGis
FreeGis
http://www.freegis.org/
Grass
Grass gis (geographic resources analysis support system) is an open source,
free software (foss) geographical information system (gis) with raster, topological
vector, image processing, and visualization functionality
http://grass.itc.it/
Java Topology Suite
Java Topology Suite
http://www.vividsolutions.com/jts/jtshome.htm
OSI
OSI
http://opensource.org/