DXF2GCODE: converting 2D dxf drawings to CNC machine compatible G-Code
LDraw™ editor for LEGO® style digital building instructions.
3D Procedural Modelling and Procedural Texturing Tool in OpenGL/C++
Free cad viewer for 3d drawings in different formats
Geostatistics and geosciences modeling software
Virtual paper folding program
3D-viewer (laserscanning) based on lwjgl
Easy to use physics simulation combining ODE with OpenInventor.