Polymaps is a free JavaScript mapping library for making dynamic, interactive maps in modern web browsers. It creates image and vector tiled maps using SVG.

Polymaps provides speedy display of multi-zoom datasets over maps, and supports a variety of visual presentations for tiled vector data, in addition to the usual cartography from OpenStreetMap, CloudMade, Bing, and other providers of image-based web maps.
Requirements: Modern web browser
Website: http://polymaps.org/
Examples: http://polymaps.org/ex/
License: BSD
Website: http://polymaps.org/
Examples: http://polymaps.org/ex/
License: BSD

