If you loved old CRPG and always craved for chance to once create your own mission(s) you are now staying possibly just one step ahead. David Walters created powerful tool to achieve that. You can easily design your level, like with squared paper and pencil, import your textures, place trapes and creatures, quick check with visualisation as you are walking by dungeon and export teasers, with all the traps just invisible for any beholder.
Supported games are Might and Magic I-III, Ultima 1, Eye of the Beholder and some of the Wizardry - thus DOS only. The tool doesn't come as a free, you must buy either Gamer or Pro license, with the latest having it all.
Check Grid Carthographer on its homepage or Twitter. To compare editions take a look here, tool has also intensive Scripting Manual and is available for Windows, MacOS and Linux, see minimal requirements down there.
Grid Carthographer was continually developed from year 2013 and you can show your support on Patreon, where you can also read a bit more about its background.
See it in action:
Thanks Angelspit for the tip!