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GeoServer
GeoServer - Geospatial Web Services
A compliant implementation of WMS plus most of the SLD extension (dynamic styling). Can also generate PDF, SVG, KML, GeoRSS
Predefined map tiles generated from vector data, raster data, and imagery.
This is the reference implementation of WFS 1.0.0 and WFS 1.1.0, supports all WFS operations including Transaction.
This server implements the WCS specification 1.0.0, 1.1.1 and 2.0.1. it's reference implementation of WCS 2.0.1. All layers published by this service are available on WMS also.
OGCAPI-Styles is a Web API that enables map servers, clients as well as visual style editors, to manage and fetch styles that consist of symbolizing instructions that can be applied by a rendering engine on features and/or coverages.
OGCAPI-DGGS provides a spatial reference system that uses a hierarchical tessellation of cells to partition and address the globe.
OGCAPI 3D GeoVolumes organizes access to a variety of 2D / 3D content according to a hierarchy of 3D geospatial volumes (GeoVolumes).