Bob's Track Builder allows you to create tracks using simple mouse clicks to form the underlying track mesh ready to be imported into popular car racing games and raced on against your friends.
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Rhinoceros Alternatives
Rhinoceros is described as 'Rhino can create, edit, analyze, document, render, animate, and translate NURBS* curves, surfaces, and solids, point clouds, and polygon meshes. There are no limits on complexity, degree, or size beyond those of your hardware' and is a 3D Modeler in the photos & graphics category. There are more than 50 alternatives to Rhinoceros for a variety of platforms, including Windows, Mac, Linux, Web-based and iPad apps. The best Rhinoceros alternative is Blender, which is both free and Open Source. Other great apps like Rhinoceros are FreeCAD, SketchUp, SOLIDWORKS and Autodesk 3ds Max.