google-sketch-up
Google Sketch Up is free 3d modelling tool for everyone. You can design your new home or office with this tool.
3d
360 Desktop
360Desktop is the desktop extender, it lets you to have more desktop space like you have four desktops or eight or more, you can pan or slide between your open windows and applications 360 degree, you will have more room than you ever needed.
With 360Desktop you also can have web clips on your desktop. You can create your own 360 degree desktop and share with other people.
Blender the free open source 3D content creation suite.
Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License.
Blender is an alternative to very expensive animation softwares, for learning and bussiness purposes and to produce high level animations.
See it on comparison chart at http://www.tdt3d.be/articles_viewer.php?art_id=99
Tutorials : http://www.tutsbuzz.com/tutorials/blender3d.html