OGMO Editor might be a bit more popular than AutoREALM. We know about 2 links to it since March 2021 and only 2 links to AutoREALM. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
AutoREALM (link) is similar to Campaign Cartographer and some others. But I highly recommend bumping to Wonderdraft once you're able to do so. Source: over 2 years ago
Autorealm - An old but moderately capable map maker. Free with a lot of tutorials. Much more on the CAD side of things than something like Wonderdraft. Source: about 3 years ago
Maybe you could use something like Tiled (https://www.mapeditor.org/) or Ogmo (https://ogmo-editor-3.github.io/). They're meant to be level editors but you can also define custom metadata for tiles. And if these tools aren't suitable I would probably write my own simple editor. Source: about 2 years ago
All of them can, you just have to write the parser yourselves. I prefer to use Ogmo. Source: about 3 years ago
Campaign Cartographer - Campaign Cartographer is the leading map making software for games (RPGs, miniatures and wargaming).
Tiled Map Editor - Tiled is a general purpose tile map editor.
PyMapper - Drag and drop tile based mapping program.
LDtk - User-friendly, open-source 2D map editor.
Inkarnate - A free-form map editor for role-playing games, focusing on overland and continental maps.
Wonderdraft - is an intuitive yet powerful fantasy map creation tool for 64-bit Windows 10, Linux, and MacOSX.