The Open GIS Consortium, a group composed of software vendors, academics, government agencies, consultants and software integrators, dedicated to open systems geoprocessing. Their first project is to develop an open geodata interoperability specification (OGIS).
OGC Web Map Server. A server responding to OGC Web Map Service requests to produce maps of georeferenced data. The OGC specification of the Web Map Service defines three WMS operations: GetCapabilities, GetMap, and (optional) GetFeatureInfo.