Programs to create 3D models?

I was looking into fabricating a bumper for my jeep. I was wondering if their was any sort of program that would allow me to mock up a 3D image of my idea. I am looking for something free but I cannot seem to find anything what I am describing. Also looking to possibly use the software to send to a shop to get the... show more I was looking into fabricating a bumper for my jeep. I was wondering if their was any sort of program that would allow me to mock up a 3D image of my idea. I am looking for something free but I cannot seem to find anything what I am describing. Also looking to possibly use the software to send to a shop to get the metal cut out of a CNC machine? Anything will help!
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