Dd Maps Maker. Great news we released DPS in Early Access. Inkarnate - Comprehensive in-browser map-making software.
More details on store page. Also supports Sci-Fi assets. Standalone app available on Steam.
With the extensive DUNGEONFOG Editor you can draw your RPG tabletop maps with just a few clicks no more patching up map tiles.
The best thing about this tool in my opinion is its integration with the Watabou One Page Dungeons tool and the DonJon Random Dungeon Generator. To me using the software feels very much like when I used to draw DD maps on graph. D. RPG Map Editor 2 is an online and downloadable DD map maker that focuses on pixel-style maps.