Xtra server
A proprietary java implementation of WFS, WMS. The package is also distributed as ArcGIS for INSPIRE Classic server extension. The team at interactive-instruments is and has been heavily involved in the definition of GML and the INSPIRE download specifications. They developed ShapeChange which is commonly used to export UML diagrams to XSD. Another product is LDProxy, an open source java implementation of the OGC API suite of standards.
- Website: https://www.interactive-instruments.de/en/xtraserver/