GeoServer

GeoServer is an open-source, Java-based map server built on the GeoTools library and backed by the Open Source Geospatial Foundation. It takes spatial data from databases such as PostGIS, Oracle Spatial, Db2, MySQL and MongoDB, or from files such as shapefiles, GeoTIFF, ECW, MrSID and JPEG2000. It then publishes that data as standard OGC web services: WMS for map images, WFS for vector features (including transactional editing through WFS-T), WCS for coverages and WMTS for tiles, with WPS available as an extension. GeoServer is the reference implementation of the OGC WFS standard. Output formats include KML, GML, GeoJSON, PNG, SVG and PDF, and map styling can be written in SLD or CSS. It suits utilities, government agencies, engineering firms and developers who need to serve infrastructure and network map layers to web clients, QGIS, ArcGIS or custom applications without paying license fees. The software is free under the GPL. Support comes from community mailing lists, or you can buy it from third-party commercial providers, since there is no single vendor offering paid tiers. Security is built on Spring Security, with LDAP, Active Directory, CAS, X.509 and header-based authentication, and role-based security at the layer and service level. The main limitation is that GeoServer is back-end infrastructure, not an asset management application. It has no work orders, maintenance scheduling or field app. Running it well takes Java and GIS administration skills, and independent load tests found weak raster reprojection and outages under heavy concurrent load unless the server has extra capacity.