Esri Geoportal Server is a free open source product that enables discovery and use of geospatial resources including datasets, rasters, and Web services. It helps organizations manage and publish metadata for their geospatial resources to let users discover and connect to those resources. The Geoportal Server supports standards-based clearinghouse and metadata discovery applications.
Esri Geoportal Server is available on GitHub. It is a stand-alone product that does not require an ArcGIS for Server license. It was released under the Apache 2.0 license, which allows developers to freely customize and redistribute the software.