Users

Libaries:

• OpenLayers
• OGR
• MapFish Java implementation? https://trac.mapfish.org/trac/mapfish/ticket/73
• GeoJSON Python Library, http://pypi.python.org/pypi/GeoJSON/1.0a3
• Shapely (GeoJSON Geometries)
• GeoRuby

Servers:

• FeatureServer
• GeoServer
• WPServer
• MapBender
• Pleiades?
• Knowhere? I Think.
• Mapufacture - Developers API
• CubeSERV WFS from CubeWerx Inc. (example)

Desktop Apps:

• FME
• Cadcorp SIS (I hear? can't find a link)
• Arc2Earth, according to http://tinyurl.com/2oo5o8

Web Services:

• geo:truc
• FireEagle - need to change "geojson" parameter to "geometry"