I love Crocotile. It's got very opinionated, kind of weird UX, but it gets me in the zone so so well. I haven't used it in ages, I should give it another spin.
I'm not sure about a lot. There are tools available that let you just extract some files from Xcode and build on Windows. These work a treat and are maintained by a single guy.
Godot 4.0 doesn't support C# on the web and mobile, one of those fabled "Godot $nextver fixes this" things that somehow immediately come up whenever I get hyped up for giving Godot another try.