Diego Inácio has created several geometry tools for Houdini, using Python.
Realtime UK - Using Houdini for Dropzone
See how Realtime UK made use of Houdini to create the effects from their Dropzone CG trailer.
RealtimeUK and Houdini
Find out how RealtimeUK used Houdini to create the complex FX of the latest Smite CG trailer.
Houdini 14 Release
Side Effects Software have announced the release of Houdini 14, with sand and crowd tools.