Text Mode Doom

Open-source hackers find it bizarrely novel to incorporate text-mode frontends for the applications which would traditionally be best suited to a more detailed interactive display. Doom is no exception, and there have been a number of attempts to develop a text-mode front-end for it.

SMMU
The source port SMMU incorporated a DOS text-based renderer.

libcaca
Libcaca is a text-rendering library that can be plugged into a variety of other programs and renderers, including libSDL. Doom (most likely prBoom) was used as a demonstration of the library's novelty.