A simple to use opensource C++ library (with examples) for openFrameworks and Cinder, for particle and constraint based physics with springs, attractors and collision. It uses a similar API to the Traer.physics library for Processing, to make transferring code from Processing & Traer to openFrameworks and Cinder as painless as possible. The library uses verlet integration for fast and stable results. All classes are template based with typedefs for 2D and 3D, so potentially it can support even more dimensions!
Download from github.com/memo/ofxMSAPhysics