A web based Geographic Metadata Catalog for data description and discovery. It implements international standards (e.g. ISO19115/19139, ISO19115-3, Z39.50, CSW 2.0, OGC). It originates from the United Nations and is used by many governments as geoportal software.
This page is not maintained actively. Active development and discussion takes place on github. You can also connect directly with the companies supporting the development.
Source code available on github https://github.com/geonetwork/