Diego Inácio has created several geometry tools for Houdini, using Python.
Making of Ambition with Houdini
Platige Image go behind the scenes on their Ambition short film and how they used Houdini for the effects.
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.