CC3+ is the fastest and most powerful map-making software in its class. In minutes you can learn all you need to rapidly create beautiful overland, dungeon and city maps for campaigns, games and real-world applications, for private and commercial use.
Inkarnate - A free-form map editor for role-playing games, focusing on overland and continental maps.
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.
Wonderdraft - is an intuitive yet powerful fantasy map creation tool for 64-bit Windows 10, Linux, and MacOSX.
Dungeon Scrawl - A dungeon scrawling tool by ProbableTrain
PyMapper - Drag and drop tile based mapping program.
Roll20 - Roll20 is a suite of easy-to-use digital tools that expand pen-and-paper gameplay.