#Get [http://sketchup.google.com/download/gsu.html Google SkecthUp7]
#Get [http://sketchyphysics.wikia.com/index.php?title=Special:Outbound&f=SketchyPhysicsWiki&u=http%3A%2F%2Fsketchyphysics2.googlecode.com%2Ffiles%2FSketchyPhysics3RC1-WinInstaller.exe SketchyPhysics3]
Ruby
[http://rubylearning.com/satishtalim/tutorial.html]
[http://sketchyphysics.wikia.com/wiki/SketchyPhysicsWiki]
SketchyPhysics
[http://www.youtube.com/watch?v=VCWz2zjCd-M]
[http://www.youtube.com/watch?v=dKSWCAjM9fA&feature=related]
[http://www.youtube.com/watch?v=3exA1bfA6G8&feature=related]
[http://www.youtube.com/watch?v=O3dSAo-Xh0I&NR=1]
[http://www.youtube.com/watch?v=l4W3Z29xv0o]
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From askoh.net wiki