Diego Inácio has created several geometry tools for Houdini, using Python.
Houdini for Games - Frima Studio
See how Frima Studio use Houdini to generate content for their games.
Arnold for Houdini
Solid Angle have released the first public release of their Arnold renderer for Houdini.
De Planeta is an animated short by Leonardo Cavaletti that revolves around the birth, life and death of a little planet.