openFrameworks is an open source toolkit designed for "creative coding". OpenFrameworks is written in C++ and runs on Windows, Mac OS X, Linux, iOS, and Android. It is maintained by Zachary Lieberman, Theo Watson and Arturo Castro with contributions by other members of the openFrameworks community.
openFrameworks is distributed under the MIT License. This gives everyone the freedoms to use openFrameworks in any context: commercial or non-commercial, public or private, open or closed source. While many openFrameworks users give their work back to the community in a similarly free way, there is no obligation to contribute.