I use Dungeon Alchemist. Excellent for quick maps, though you will find yourself spending many hours making the perfect map for your situation from time to time. There's also constant free updates with huge additions to assets, biomes, QoL and so on, with a -huge- update due in a month or so. The community is great too; thousands of user-made assets and maps are available free on steam workshop. Devs are very active and take community requests and ideas well. If you'd like examples of what sort of thing can be done, I have hundreds of free maps here that were made in DA. Answer from -SaC on reddit.com