SketchUp

SketchUp (also known as Google SketchUp) is a 3D modelling program for a broad range of applications such as architectural, civil, mechanical, film as well as video game design — and available in free as well as ‘professional’ versions. The program highlights its ease of use, and an online repository of model assemblies (e.g. , windows, doors, automobiles, entourage, etc. ) known as 3D Warehouse enables designers to locate, download, use and contribute free models.