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Elevation is a free, open source route visualizer that renders GPS data in 3D space, built in Processing by Dave Shea. You’ll need to have a GPS-equipped phone or device capable of tracking your activity as you run, hike, cycle, skate, ski, snowboard, or whatever other physical activity you choose to map. You’ll also need the ability to export that data as XML, in either GPX or KML format. (If you have files in just about any another format, you can probably use GPSBabel to convert them to GPX files and get them working with Elevation. (via ltg)