GeoNetwork is an open source software server written in Java that allows users to catalog datasets and resources using XML metadata standards such as ISO19115 and dublin core. It includes a map viewer for displaying styled layers from OGC Web Map Services (WMS) and includes GeoServer for publishing data.

GeoNetwork uses open standards interfaces and protocols for searching and harvesting. It is the reference implementation of the Open Geospatial Consortium (OGC) Catalog Service Web (CSW) version 2.0.2.