MapProxy

MapProxy is an open source proxy for geospatial data. It caches, accelerates and transforms data from existing map servers. Unlike other solutions, the OGC WMS standard remains on client and server-side.
It is a middle-man between existing web map servers (like MapServer or GeoServer) and clients. All existing web and desktop GIS applications can be used, but also modern clients like OpenLayers and GoogleEarth.



http://mapproxy.org/