Diego Inácio has created several geometry tools for Houdini, using Python.
Point Render for Houdini
Point Render is an extension for Houdini that expands 3D rendering for computing scenes with full freedom of artistic effects.
Graham Collier Interview
Particle Skull have interviewed VFX artist Graham Collier about his career and CG knowledge.
Houdini for Games - Frima Studio
See how Frima Studio use Houdini to generate content for their games.