Houdini 14 - Sand/Snow RnD
Graham Collier has created some sweet sand and snow tests using the new Houdini 14.
Houdini Engine for Autodesk Maya
SideFX have released Houdini Engine for Maya, with 3ds Max and Unreal versions coming soon.
Houdini Geometry Tools
Diego Inácio has created several geometry tools for Houdini, using Python.