Diego Inácio has created several geometry tools for Houdini, using Python.
Side Effects Software have announced the release of Houdini Indie for independent animators and game makers.
Houdini 13 Update
Side Effects's latest version of Houdini 13 comes with new particles, finite element solver, lighting workflow and more.
Houdini - Demo Reel 2013
Side Effects Software have unveiled the 2013 Houdini Demo Reel.