Tokumaru has released a ROM of his raycaster engine for NES/Famicom.
Current features:
. 8×16 pixels 1-bit wall textures;
. Up to 3 different wall colors per room (shades achieved through dithering);
. Map sizes up to 128×128 blocks (AFAIK, Wolf3D levels were 64×64);
A video in action can be seen here: https://www.youtube.com/watch?v=po69zgqyFWM
AEP-Emu (DE/EN)
DMG Page (DE)
EmuBit.pl (PL)
HomebrewWelt (DE)
Indie Retro News (EN)
NintendoMax (FR)
PlayerAdvance (FR)
Retroguru (EN)