The MapFish framework allows to build rich Web GIS Applications in an easy and flexible way. It combines some of the best Open Source Tools in one framework: OpenLayers 2, ExtJS3 and GeoExt4 on the client side, and MapFish print, Ruby or Python modules (especially Papyrus based on Pyramid) on the server side. Besides the OGC-Standard web services, a MapFish protocol adapted to the efficient communication between Client and Server is available. On this basis, complex and high performance web mapping applications have been built. Among them, one MapFish-based project will be presented in more detail in order to show the power of the MapFish Framework: the c2cgeoportal is a complete WebGIS with large set of tools and configuration options. Since its beginning, the plug-in based architecture makes each application unique and adapted to the specific use case. The presentation gives a general overview of the MapFish Framework and demonstrates its possibilities with the c2cgeoportal implementation.