Workshop: vvvv beta Workshop
The mother of data-flow and block-based visual multimedia programming languages with a great community and with literally thousands of nodes. Probably not the mother, but the first really big and flexible implementation. Lately succeeded by vvvv gamma, the very mature original (20y+), named vvvv beta is still it’s own beast to create live interactive data driven graphics. For it there is also a huge list of user contrubutions that grew over the years.