"Cinder is a community-developed, free and open source library for professional-quality creative coding in C++."

"We’re starting to dip our toes in the waters of prototyping again. One of the first steps was trim down the framework we built for World of Goo and gear it towards a rapid prototyping workflow."

"The Particle System API allows C++ application developers to easily include dynamic simulations of groups of moving objects. The API is much lighter weight than a full physics engine. It is especially useful for eye candy in games and screen savers, but is also used in off-line animation software."

C++ physics engine, recently ported to the iPhone