One that's missing, though, is Max/MSP, a visual programming environment focused around music & other media. It's used heavily by many experimental musicians and artists.
As much as I like playing with Max and PureData, I think they also highlight some of the many problems with the whole "Visual Programming" thing.
They don't play well with version control and are a nightmare to debug. The developer will also quickly hit a point where the visual nature of the tool becomes more of a hindrance than a help, when they're left drowning in a tangled mass of pipes and boxes.
I would really love to see a fresh take on this idea and an attempt to address some of the above problems.
Yes! The guy that made Max eventually made PureData (which is in the list). It's an awesome environment. Max (General) with MSP (Audio) and Jitter (Video) can do a lot of stuff, even control full lighting rigs + video, or even have a nice visual interface to an arduino. They recently integrated with Ableton Live too so you can use MSP patches as instruments. It's a great platform.
One that's missing, though, is Max/MSP, a visual programming environment focused around music & other media. It's used heavily by many experimental musicians and artists.