TheWeb GIS libraries and theWeb Map Development Frameworks are two categories that encompass GIS software used to build the final interface to display geographic data as dynamic maps on the web. The web GIS libraries are application programming interfaces (API's) for the visualization and manipulation of spatial data that implement the WMS, WFS, etc. OpenLayers (Hazzard, 2011) is one of the most extensive libraries in this category, it is implemented in JavaScript. Finally, the software in the Web Map Development Frameworks category, contribute with tools for creating advanced web applications. These frameworks use the web GIS libraries and contain tools for the management of layers, menus, and themes of the Web GIS sites. Some well known programs in this category are Mapbender3 (http://mapbender3.org/), GeoMajas (http://www.geomajas.org/), MapFish (http://www.mapfish.org/) and Geo-MOOSE (http://www.geomoose.org/). OWGIS belongs to this last category as it gives an easy way to develop Web GIS sites through the configuration of XML files. The main feature that differentiates OWGIS from the rest of the development frameworks is the set of tools that OWGIS provides to visualize 4D data through the web.