Campaign Cartographer - Campaign Cartographer is the leading map making software for games (RPGs, miniatures and wargaming).
Roll20 - Roll20 is a suite of easy-to-use digital tools that expand pen-and-paper gameplay.
Astral Tabletop - Create, host, and manage your tabletop role-playing games — online or in person
Tabletop RPG Map editor 2 - RPG Map II is a “tabletop RPG” oriented map maker, created with the “keep it clean & simple” philosophy in mind.
D&D Beyond - Official online toolset for Dungeons & Dragons tabletop gaming
Dungeon Scrawl - A dungeon scrawling tool by ProbableTrain