Diego Inácio has created several geometry tools for Houdini, using Python.
Houdini 15 Sneak Peek
Side Effects will be showing Houdini 15 at SIGGRAPH 2015, but first here is a feature trailer.
Arnold 4.2 Sets New Performance Standards
Solid Angle will showcase Arnold 4.2 with Cinema4D and Houdini plug-ins at SIGGRAPH 2014.
Houdini Engine for Autodesk Maya
SideFX have released Houdini Engine for Maya, with 3ds Max and Unreal versions coming soon.