WebGL based viewer for Kepler orbits described by two-line element sets (TLEs).
Try it out here: http://veralin.dk/satellite/
Go download some .txt (TLE) files from http://celestrak.com/NORAD/elements/master.asp, then run mangler.py on them to generate a new data set (it will overwrite data0.js)
I place the code in the public domain. The texture map (earth.jpg) is also public domain - it comes from my other repository: https://github.com/sqaxomonophonen/worldmapsvg. I don't know about data0.js - CelesTrak does not mention any license conditions.
Have fun!