OGC

OpenGeo is the maker of the OpenGeo Suite, an enterprise GIS/web stack based on the official standard products of the Open Geospatial Consortium.  OGS contains Open Layers, PostGIS, GeoServer, and more.

In addition to the commercial version, a "community edition" is available with only community support available.  This isn't just click-and-point Google Maps, but for those people looking for a robust, full-featured, open source GIS stack, OpenGeo Community is a great choice.