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Pure Data and Max had GEM in 1996. Pure Data is still a pretty capable graphics system today.

https://puredata.info/downloads/gem/documentation/manual/pub...

Also, vvvv had its public release in 2002. TouchDesigner was released in 2008.

Although I do like Processing, I am surprised these visual languages haven't caught on as much as Processing.

The environments you mention have different mechanics and a steeper learning curve. Also, my opinion, less programmer friendly - its for those who want to connect stuff together rather than write code. They usually produce not very dynamic experiences that feel very similar and mainstream.

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