Diego Inácio has created several geometry tools for Houdini, using Python.
Houdini 14 - Sand/Snow RnD
Graham Collier has created some sweet sand and snow tests using the new Houdini 14.
Tea and Cookies in Houdini - Tutorial
Tea and Cookies in Houdini is a two part commercial tutorial in Houdini, going through all the steps of the scene's creation.
De Planeta is an animated short by Leonardo Cavaletti that revolves around the birth, life and death of a little planet.