Townscaper is more like a toy than a tool, and it's not out yet, even in early access. Still, it would be cool to use something like this with tabletop RPGs:
https://store.steampowered.com/app/1291340/Townscaper/Build quaint island towns with curvy streets. Build small hamlets, soaring cathedrals, canal networks, or sky cities on stils. Block by block.
No goal. No real gameplay. Just plenty of building and plenty of beauty. That's it.