Diego Inácio has created several geometry tools for Houdini, using Python.
Houdini Roadmap Presentation
Have a look at the Houdini roadmap, a look into the Houdini of today and the Houdini of tomorrow.
Side Effects Software have announced the release of Houdini Indie for independent animators and game makers.
Houdini 13 Update
Side Effects's latest version of Houdini 13 comes with new particles, finite element solver, lighting workflow and more.