"GeoNetwork opensource is a catalog application to manage spatially referenced resources. It provides powerful metadata editing and search functions as well as an embedded interactive web map viewer"
"GeoNetwork opensource has been developed to connect spatial information communities and their data using a modern architecture, which is at the same time powerful and low cost, based on the principles of Free and Open Source Software (FOSS) and International and Open Standards for services and protocols (a.o. from ISO/TC211 and OGC)"
USGIN's primary interest in this client/server hybrid application package is its CSW service and ISO 19139 metadata capability. GeoNetwork also include the Geoserver (WMS, WFS, WCS servers) and Intermap (WMS client) Web applications.