Another powerful visual programming language is called VVVV which you can find at https://vvvv.org/ I think they will be shortening it to VL with the next release. I had experimented with it back in 2011 trying to make a poor man's multi touch interface for the PC using an iPad and Touch OSC. https://www.youtube.com/watch?v=DYEtkJSvZCk It has a pretty clean/ minimalist UI and one of the more interesting implementations of visual programming.