What is REXPaint?
REXPaint is a powerful and user-friendly ASCII art editor. Use a wide variety of tools to create ANSI block/line art, roguelike mockups and maps, and for other roguelike development needs. Originally an in-house dev tool used by Grid Sage Games for traditional roguelike development, this software has been made available to other developers and artists free of charge. While core functionality and tons of features already exist, occasional updates are known to happen. Unlock your retro potential; join thousands of other REXPaint users today :D
The latest version can always be found on the Downloads page.
REXPaint is Windows-only, but runs nicely under Wine in Linux/OSX.