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Have you looked at Rhino?

From their site.

Rhino can create, edit, analyze, document, render, animate, and translate NURBS curves, surfaces, and solids with no limits on complexity, degree, or size. Rhino also supports polygon meshes and point clouds. Rhino offers:

Uninhibited free-form 3-D modeling. Tools like those found only in products costing 20 to 50 times more. Accurately model any shape you can imagine.

Extreme precision. Design, prototype, engineer, analyze, document, and manufacture anything of any size no matter how small or how large.

Unrestricted editing. Revise freely without concern about how you got there or where you want to go next.

2-D drafting, annotation, and illustration. In addition, flatten 3-D surfaces into 2-D patterns and drive laser, plasma, and water jet cutters.

Large project organization. Work with both large models and large teams.

www.rhino3d.com