The following list is a collection of  GIS open source projects sorted by the hits according to oschina

  • GIS – sharpMap
  • GeoServer
  • SharpMap
  • OpenLayers
  • OpenCity
  • QGis
  • NetTopologySuite
  • GRASS
  • GeoTools
  • PostGIS
  • GeoWebCache
  • OpenMap
  • VikGPS
  • TileCache
  • jvmobilegis
  • GeoAPI
  • gvSIG
  • OpenGTS
  • Gpredict
  • openJUMP
  • simpleMapServer
  • SAGA
  • msCross
  • CartoWeb
  • mapbuilder-lib
  • gpsd
  • GpsMid
  • viking
  • geGis
  • QuickWMS
  • SaVi
  • uDig
  • Geomajas
  • GisToolkit
  • kvwmqp
  • pygpslog
  • TM++
  • GMaps4JSF
  • MsSqlSpatial
  • gullsview
  • JUMP project
  • MyToorbook
  • Mapyrus
  • GeOxygens
  • GeoQO