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In various perspective views you may create line graphics or hidden line graphics. CYCAS exports its 3D data in various formats in order to pass these data on to software for creating computer based graphics. Therefore, you can quickly arrange a high quality presentation of your design. In addition to typical CAD functions, CYCAS offers [...]

Blender is the open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback. Available for all major operating systems under the GNU General Public License.
Download: Blender Size: 2 MB OS:Linux, Solaris, Win (all)

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http://sarugu.com/2007/07/01/blender-244-open-source-3d-content-creation-suite/

AlterJig is a tile jigsaw puzzle game. You select one of several graphics supplied with the game or create your own puzzle from any bitmap. When you select new game, AlterJig scrambles the puzzle and challenges you to restore the picture by rotating groups of four tiles to get the tiles back to their proper [...]

K-3D is the free-as-in-freedom 3D modeling, animation, and rendering system for GNU / Linux, Posix, and Win32 operating systems. K-3D features a robust, object-oriented plug-in architecture, designed to scale to the needs of professional artists, and is designed from-the-ground-up to generate motion-picture-quality animation using RenderMan-compliant render engines. We strongly recommend the Aqsis (http://www.aqsis.org) render engine [...]