Spatial Feature Server is described as 'By MapET is an ESRI Geoservices REST Implementation and works with all ESRI Rest API's. The source of published data is the spatial extension of the major RDBMS, such Oracle, Microsoft SQLServer, MySQL, PostgreSQL' and is a GIS software in the travel & location category. There are more than 25 alternatives to Spatial Feature Server for a variety of platforms, including Windows, Web-based, Linux, Mac and Android apps. The best Spatial Feature Server alternative is QGIS, which is both free and Open Source. Other great apps like Spatial Feature Server are Plus Codes, ArcGIS, Maptitude and what3words.