Nowadays I do all my diagrams in Figma. Its a ui tool first but its so flexible it just works for any use case. And it has a strong component functionality so o

Nowadays I do all my diagrams in Figma. Its a ui tool first but its so flexible it just works for any use case. And it has a strong component functionality so once you build a library of "blocks" for you use cases it's trivial to creatr alternate diagrams. For those dismissing figma cause its a ui tool.. I'm a dev first but did a short course on ux/ui and got introduced to it. 15 min you tube tutorial was all was needed to get it and they have a Web app that works on all oses. Try it