[ubuntu] Computer aided design on Ubuntu

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http://ubuntuforums.org – I'm a newbie in the world of computer aided design, but I am trying to design and build a battlebot and I figure this might be a project where I can get my fingers caddy. I want something free (as in beer) - that's right, I'm a freeloader :P I was thinking of using the Windows version of SketchUp on the Windows 7 part of my computer. But then I thought: I use Ubuntu for just about every other computer-related activity, why not use an Ubuntu-compatible "CAD" thing? I looked at the Ubuntu Software Centre (yuck!) and found 3 apps that might be applicable - LibreCAD, PyCAD and SagCA (Hardware)