Alice
Create 3D models and learn programming with an easy drag-and-drop method designed for students.
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&mdash 3 so far
 
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Blender
A free open source 3D content creation suite, available for all major operating systems under the GNU General Public License.
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Sweet Home 3D
Interior design app helps you place your furniture on a house 2D plan, with a 3D preview. Choose from a variety of rooms and objects to put in them.
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Wings 3D
Create three-dimensional models such as a frog or, well, how about SpongeBob Squarepants. Check out the gallery to see the amazing things that are possible. Actually, there seems to be no shortage of entries in this category, with Blender, POV-Ray and Art of Illusion to round things out.
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Also try: POV-Ray
Art of Illusion