Back around 2000 or 2001, I got the idea for a collaborative editor that also would have had some UI fanciness in it. I abandoned it when I couldn't find a GUI

Back around 2000 or 2001, I got the idea for a collaborative editor that also would have had some UI fanciness in it. I abandoned it when I couldn't find a GUI toolkit that had an acceptable level of quality for that UI fanciness, without itself becoming a multi-year project. So I never even got to the point of playing with the actual collaborative editing aspects. Having watched that space now for the last nearly 25 years... of all the projects I've abandoned over the years, that is the one that I am most grateful I gave up on. The gulf between "hey what if we could collaboratively edit live" and what it takes to actually implement it is one of the largest mismatches between intuition and reality I know of. I had no idea.