goworldwind.org | All World Wind resources in one placeWorld Wind is a free, open source API for a virtual globe. Written in Java so as to be cross-platform and easy-to-use, World Wind allows developers to quickly and easily create interactive visualizations of 3D globe, map and geographical information.NASA
Fluster - A clustering algorithm for the Google Maps API v3Fluster is a clustering algorithm for the Google Maps API v3. It manages all your markers on the map and summarizes them to "clustered markers" if there is not enough space around them. Acts like MarkerClusterer for v2.