At present Mapstraction provides support for APIs from the following nine providers: * FreeEarth (experimental support) * Google * Map24 * MapQuest * Microsoft * MultiMap * OpenLayers * OpenStreetMap * Yahoo
Mapnik is a Free Toolkit for developing mapping applications. Above all Mapnik is about making beautiful maps. It is easily extensible and suitable for both desktop and web development.
OpenStreetMap is a free editable map of the whole world. It is made by people like you. OpenStreetMap allows you to view, edit and use geographical data in a collaborative way from anywhere on Earth.