FreeCAD
Release status: WIP
FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture or other engineering specialties. It is 100% Open Source and extremely modular, allowing for very advanced extension and customization. FreeCAD is based on OpenCasCade, a powerful geometry kernel, features an Open Inventor-compliant 3D scene representation model provided by the Coin 3D library, and a broad Python API. The interface is built with Qt. FreeCAD runs exactly the same way on Windows, Mac OSX and Linux platforms. more here...
Even though FreeCAD is in development its quite useful even at this stage.
As always; learning new things may seem daunting, but remember those dreams of yours and keep RepRaps philosophy close at heart!
There are several helpful resources just clicks away:
· Getting started
· FreeCAD's Forum
· FreeCAD's IRC channel
Contents
Tutorials
· FreeCAD's own Tutorial pages.
Youtube
Beginner
· TurboTute - Pockets & Pads.
Gives you an idea just how easy it can be to build a object in FreeCAD.
Series
Designing a bicycle
Avid Free software user 5needinput has made this series of Designing a bicycle.