I've only dabbled with Foundry, but right now my little project at dnd.ittybitty.tips has been my go to. It's something I'm always tweaking, and doesn't have a VTT at the moment, but I'm working on nostr integration where I can.

I've mostly used roll20, but I'm hoping to move away from it to something cleaner. Just came across this community within nostr, so hoping to learn a lot.