OSGeo
http://www.osgeo.org/OSGeo is a non-profit organization serving as an umbrella organization for the Open Source Geospatial community.
OSGeo is a non-profit organization serving as an umbrella organization for the Open Source Geospatial community in general and several code projects in particular:
Content Management Systems
GeoNode
Desktop Applications
GRASS GIS gvSIG Marble QGIS
Geospatial Libraries
FDO GDAL/OGR GEOS GeoTools Orfeo ToolBox (OTB) OSSIM PostGIS
Metadata Catalogs
GeoNetwork pycsw
Web Mapping
deegree geomajas GeoMOOSE GeoServer Mapbender MapFish MapGuide Open Source MapServer OpenLayers
Incubating Projects
Opticks MetaCRS istSOS PyWPS Team Engine ZOO-Project
Outreach Projects
GeoForAll - Education and Curriculum OSGeo-Live
OSGeo Community Projects
Geoinformatica GeoWebCache MapProxy pgRouting Postal Address Geo-Coder Virtual Terrain Project
We host regional and international FOSS4G conferences with typical attendance of 500-1000+ geospatial developers, industry and government leaders, and researchers. Our mailing lists collectively go out to ~ 29,500 unique subscribers.
Primary Open Source License: MIT license (MIT)