ASCII Mapper

ASCII Mapper is a tile map editor made in HTML5, that uses characters from the keyboard instead of graphical tiles, similar to text-based roguelikes. It's barebones, made in a hurry to support the development of Electric Rogue, and only polished enough to make public. It nevertheless proved very useful, as it's quick to start with, and spares the user from having to hunt down tile packs with suitable licenses. At least for the map-making; note that Electric Rogue itself does feature graphics.

Making Game Maps With Plain Old Text describes the concept in more detail. More features may be added on request, or as a future game requires.