Diego Inácio has created several geometry tools for Houdini, using Python.
Arnold for Houdini
Solid Angle have released the first public release of their Arnold renderer for Houdini.
De Planeta is an animated short by Leonardo Cavaletti that revolves around the birth, life and death of a little planet.
SideFX have announced Houdini Engine, an API that will facilitate Houdini integration into proprietary studio software.