Diego Inácio has created several geometry tools for Houdini, using Python.
Houdini 14 Release
Side Effects Software have announced the release of Houdini 14, with sand and crowd tools.
Arnold for Houdini
Solid Angle have released the first public release of their Arnold renderer for Houdini.
Jayden Paterson - Houdini FX Reel 2014
Jayden Peterson has posted a reel showcasing his Houdini FX work.