vvvv is a hybrid graphical/textual programming environment for easy prototyping and development. 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.

vvvv is a multipurpose toolkit. A graphical programming authoring environment. vvvv is suitable for many tasks involving common computer related media like audio, video, 3d animation, the internet…

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vvvv is free for non-commercial use,
commercial use requires a license.