I started on this project over 3 years ago, but then FFR got popular, so I went all-in on that. But lately I've had the itch to come back to this thing and flesh it out.https://github.com/Entroper/FF4MapEdit/releases
This is a map editor for FF4 for SNES, though I suppose it's really FF2US, version 1.1.
Originally, this was intended to be a companion to the excellent ff4kster tool, which edits nearly everything about FF4 except the World Maps. In 2016, I had it editing the Overworld map, but recently I added support for editing the Underworld and Moon maps as well, and started on a bunch of nice features like undo/redo and flood fill. It's coming along nicely, and there are several more features I intend to work on
. Please feel free to open a new issue there if something doesn't work.