Diego Inácio has created several geometry tools for Houdini, using Python.
Houdini Engine for 3ds Max
Houdini Engine, the 3ds Max plug-in enabling Max artists to import and edit content created within Houdini, is now available for free.
Houdini for Games - Frima Studio
See how Frima Studio use Houdini to generate content for their games.
See the new features and improvements in Side Effects Software's fresh release of Houdini 12.5.