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.
Coloring Particles at Birth in Houdini
In this tutorial we learn how to color particles at birth in Houdini.
Houdini - Apprentice Cook-Off Challenge
Join the Apprentice Cook-Off, a summer long challenge for Houdini users.