CAD for Game Design
Rhino3D
is NURBs surface modeling for Mac by Robert McNeel Inc. The Mac version is still in Beta mode at this stage but if it’s anything like its Windows brother, when released it too will be very popular. Rhinoceros 3D for Windows is a powerful 3D modeler that is particularly good for complex surfaces and is used extensively in the product design, industrial design, ship design and jewelry design industries.
SketchUp
is a world wide phenomenon in 3D modelling software, On its own it can be used to very quickly design and decorate interior spaces but works best when combined with a good 2D drafting tool to create cabinet making documents or detail plans. A good combination is SketchUp with RealCAD. RealCAD has a direct SketchUp file import facility and will be extremely useful in all the 2D detailing of your 3D designs.