Or use Rattlecad, which is free, and pretty easy to use. It won't give you a full CAD drawing, but it'll give you all the information you would normally require to build a frame.
@Brommers started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Or use Rattlecad, which is free, and pretty easy to use. It won't give you a full CAD drawing, but it'll give you all the information you would normally require to build a frame.