Google recently bought 3D software SketchUp. SketchUp is a simple but powerful tool for quickly and easily creating, viewing and modifying your 3D ideas.
It is available as a basic free download as well a professional paid one for 495$. Currently available only for windows platform.
Google SketchUp (free) is an easy-to-learn 3D modeling program that enables you to explore the world in 3D. With just a few simple tools, you can create 3D models of houses, sheds, decks, home additions, woodworking projects - even space ships. And once you’ve built your models, you can place them in Google Earth, post them to the 3D Warehouse, or print hard copies.
Google SketchUp (Pro 5) - 495$ is a powerful 3D modeling tool whose robust feature set empowers design professionals to explore and communicate complex concepts, import and export a host of file formats, and create interactive presentations. You can also use SketchUp Pro to print to high-resolution devices, place your models in Google Earth, and post them to the 3D Warehouse.
Minimum configuration for PC:
* Microsoft Windows® 2000, XP Home or Professional Editions
* 600 MHz Pentium® III processor
* 128 MB RAM
* 80 MB of available hard-disk space
* Video card that is 100% OpenGL compliant
* Windows compatible pointing device
* Microsoft® Internet Explorer 6.0 or higher
* Windows® Media Player or QuickTime 5.0 and web browser for multimedia tutorial.
Recommended configuration:
* 2 GHz Pentium® 4 processor or higher
* 512 MB RAM
* 3 button, scroll-wheel mouse
Official Site: http://sketchup.google.com/
Download: http://sketchup.google.com/download.html