Sensor Observation Service
http://www.opengeospatial.org/standards/sos
Web Coverage Service
http://www.opengeospatial.org/standards/wcs
Web Feature Service
http://www.opengeospatial.org/standards/wfs
Web Map Service
http://www.opengeospatial.org/standards/wms
OPeNDAP
http://www.opendap.org/