Complete open source laser cutter/engraver - The design is completely open source with all drawings, schematics, BOMs (with sources and prices), 3D models, build instructions, software and Gerber files available.
Art of Illusion 3.0 – the newest free open source 3d modeling, rendering & animation studio: Java-based open source Art of Illusion, a free 3d modeling, rendering & animation studio, can transform your creativeness to the next level.
Blender: Free & Open Source - Video Editing, 3D Modeling, Sculpting, Painting, Rigging, Animation, Compositing, Special Effects, Rendering, Camera Tracking/Matching (to integrate 2D video with 3D animation,) etc...
FreeCAD is a parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters. FreeCAD is open-source and highly customizable, scriptable and extensible.