Side Effects Software have unveiled the 2013 Houdini Demo Reel.
Houdini Engine for Autodesk Maya
SideFX have released Houdini Engine for Maya, with 3ds Max and Unreal versions coming soon.
Jayden Paterson - Houdini FX Reel 2014
Jayden Peterson has posted a reel showcasing his Houdini FX work.
Houdini Geometry Tools
Diego Inácio has created several geometry tools for Houdini, using Python.