Sketch Up, free

Beyond the general awesomeness of the announcement of freeness- it's a great place to practice Ruby (if not Ruby on Rails). The features aren't that different between the pro and free version (mostly , but the $495 pro is required for commercial/government use.

Free SketchUp.

If you haven't checked out the 8 hour trial- there's no reason not to now...I can't wait to see what starts showing up on the 3D Warehouse!

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