http://vvvv.org/tiki-index.php

“vvvv is a toolkit for real time video synthesis. It is designed to facilitate the handling of large media environments with physical interfaces, real-time motion graphics, audio and video that can interact with many users simultaneously. vvv uses a visual programming interface. Therefore it provides a graphical programming language for easy prototyping and development. vvvv is real time. where many other languages have distinct modes for building and running programs, vvvv only has one mode – runtime”.

via: modisti