The new version of Kangaroo (2.0) is now available on food4Rhino.
This is a complete rewrite of the solver and all components. It is a first release for testing. All the features are still subject to change.
You can install this alongside the older version.
Kangaroo is a an interactive physics/constraint solver and Grasshopper plug-in for designers. It consists of a solver library and a set of Grasshopper components.