Stamen maps allow users to visualize geographical data in three different ways: toner maps (black and white, worldwide), terrain maps (US only), and watercolor maps.
OpenStreetMap is a project utilizing the power of collaboration to create wiki-style maps with open geographical data (viewable, usable, editable). Data are gathered from a variety of sources, including individual GPS units, aerial photography, and copyright-free maps.
Via Deep Focus.
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