Eomodeller
I've been working on a web based UML modelling tool for a while now. It's gone through a few technical iterations before this version really progressed well. It does live updates between two browser windows, and supports iPad pen input. I know UML is not all that popular with many people, but I use it all the time and most of the other tools were not very good, so it's kind of yak-shaving too, I use it every day myself. It's got ArchiMate support but I've disabled that until I can pay the license fee. I started out with a wasm version, which worked ok, but needed a lot of work, then moved to SwiftUI which got me further, then ported that to HTML/JavaScript, so it's been a bit of a journey exploring what can be achieved with web technology, I'm more of a backend developer, so this has been interesting. I'm at the stage where I could do with some feedback from other users. It's much more fun programming, and using it myself, but have to move on eventually. https://eomodeller.com