I’ve been happily surprised by seeing Gridmapper used on the Ruins of the Undercity blog where the Idle Doodler talks about solo play – something I have never tried. OK, maybe I tried the AD&D 1st ed. random dungeon generator back in the eighties, once.
Anyway: it looks pretty cool!
Gridmapper hasn’t seen a lot of development in recent years, but if you like a web app that’s best used without a mouse to create dungeon maps, maybe could give it a try. My recommendation is to visit the page and click on the Demo link at the bottom.