The design and implementation of this system were based on state-of-the-art technologies through which, the application was smoothly and fast operational at all levels. In particular, the AJAX technology was used, and through the JSON format data are downloaded from the Server asynchronously in the background without the need to renew the application. Additionally the system was based on the ExtJS Framework, considered as the most suitable for the development of web applications. The GXP library was also utilized, which includes a large number of cartographic tools for the Internet. By exploiting the GeoServer capabilities and the GeoWebCache tool, the application became faster, since the response to the various spatial clients’ requests was quick and efficient. The implemented spatial content management system provides management capability in issues relating to the users’ processing, the organization and transfer of spatial data in the GeoServer, as well as their online processing through the WFS-T supported by the GeoServer.