Free 3D modeling software Sketch up
If you are looking for some amazing 3D software with an intelligent drawing and animation system, take a look at Google's 'SketchUp' software. It get's better. SketchUp is 100% free and is fully functional.
Google also supplies a 3D Warehouse with hundreds of pre-built models that you can download or share with others.
This software is fantastic for Avid and Final Cut Pro users who want to be able to incorporate 3D animation into their video projects. Better yet, the software is extremely easy to use.
The software even allows you to upload your own models to Google earch.
Of course, Google does have an upgraded version called SketchUp Pro for those who are serious about 3D design.