A reference implementation is a fully functional implementation of a specification in reference to which other implementations can be evaluated. The OGC provides open source reference implementations to ensure maximum transparency of its specifications for both vendors and customers. OGC reference implementations are provided as-is, with no implied or explicit warranty from the OGC or implementation creators. The OGC does certify that these implementations are compliant with their respective specifications.

Web Coverage Service 1.0.0
Web Map Service 1.3
Web Map Service 1.1.1

• Developed by: lat/lon
• Product Name: deegree
• License: GNU Lesser General Public License (GNU LGPL)

deegree Server Software
The central concept of deegree is the realization of the best possible interoperability using structured geographic information architectures. This is managed by the implementation of the standards from both the Open Geospatial Consortium and ISO. deegree implements the OGC CSW, WMS, WFS, and WCS specifications and can be configured to be a 1.0 compliant WCS as well as a 1.1.1 and a 1.3 compliant WMS.

Web Coverage Service 1.1.0
Web Feature Service 1.1
Web Feature Service 1.0.0

• Developed by: OpenGeo
• Product Name: GeoServer
• License: GPL 2.0 license

The GeoServer project is the WCS 1.1.0, WFS 1.1 and WFS 1.0.0 reference implementation. GeoServer is open source, standards-based, geographic middleware. The project is a Java (J2EE) implementation of the OpenGIS Consortium's Web Feature Server specification. It is free software, available under the GPL 2.0 license.

Catalogue Services/Web 2.0.1

• Developed by: United Nations Food and Agriculture Organization (UN FAO)
• Product Name: GeoNetwork
• License: GNU GPL

GeoNetwork opensource is a standards based, Free and Open Source catalog application to manage spatially referenced resources through the web. It provides powerful metadata editing and search functions as well as an embedded interactive web map viewer.