TopMod3d is a free, open source, topological mesh modeling system that allows users to create high genus 2-manifold (watertight) meshes. It runs on Windows and OSX.

To me, topological modeling feels weird, but after playing around with it for a little I managed to get some nice results. As an added bonus most models will be readily printable by Shapeways (after conversion to X3D/Collada, still).

Links

• Download
• Gallery
• Tutorials

Here are some videos that are interesting to watch:

'Twisted Cube Handles'

(This interface version is outdated, but the way of working is still the same)


'Tetrahedron Spikes'



'Generated models'
Some nice models made in TopMod3D