DOS-based GUI, WYSIWYG level editor for tile based games. Completely customizable enemy placement and tile layout. 256 color.
There's also a windows version.
FAQ:
Q: When I run the Mapmaker, my fonts appear garbled.
A: A font file, (with a SFT extension), probably couldn't be loaded. Check to make sure your SFT files are present - if that doesn't work,try re-installing the software.
Q: The MapMaker crashes at the title screen.
A: You probably don't have your mouse driver loaded. A mouse driver (i.e., MOUSE.COM, or MS-DOS's MOUSE.SYS) is required for MapMaker to run.