The Game Development Toolset is a collection of high level tools aimed to speed up games related workflows in Houdini. There are over 30 tools that range from UVing to generating Motion Vectors from simulations.
Physics Painter is a Houdini Digital Asset (HDA) that allows users to paint physics objects onto any other object, and simulate gravity. The result of the previous simulation can be fed into a new iteration of a simulation as often as required. The user gets control over a couple of parameters, which allows the user to get their desired result.
Learn how to use Physics Painter with this new free video Tutorial