Hello. Below is an unfinished list of modular synths. Better than nothing. This kind of simple lists gives a good overall picture of the situation. For us developers the list should have following info: have source code? have manuals? have screenshots? have example instrument files? I think I have collected enough all of that. BTW, the paper on first interactive graphics system (I.Sutherland's SketchPad 1963) gives the idea that the drawn circuit diagram could directly be used as input to the circuit simulators. Digital modulars have been around as long but I could not find anything (between 1963-1980) on having a graphical frontend to them. Of course, I do not have access to many old papers.

From google I only found this information: