Diego Inácio has created several geometry tools for Houdini, using Python.
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.
Side Effects - FLIP Fluids in Houdini
Side Effects have announced a new webinar series, starting with one focusing on FLIP fluids in Houdini.