This is a little toy I wrote for fun.  It's a multibody gravity simulation.  The most natural use for this is, of course, creating a solar system, so that's what the sample data is.  Just a few planets though, no moons so far.

TODO:
   * fix the code before posting it (oops - it was working a few days ago, I swear!)
   * add some moons into the sample code.
   * add in some trojans (asteroids)
   * add ability to center on a particular body
   * optimize (with [CriTcl] perhaps?)

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[schlenk] Hmm, may i suggest OpenGL support for 3D? 
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See also [TclPlanets]