A free service that lets anyone publish interactive data to the web. Once on the web, anyone can interact with the data, download it, or create their own visualizations of it. No programming skills are required.
Donated by David Rumsey to Stanford University Library, this collection includes over 150,000 digitized maps, including atlases, globes, wall maps, school geographies, pocket maps, books of exploration, maritime charts, and a variety of cartographic materials. Items range in date from around 1550 to the present.