Original MDL version: https://github.com/MITDDC/zork

DECUS fortran version: https://www.ifarchive.org/if-archive/games/source/dungeon-3....

f77 version for Unix: https://github.com/videogamepreservation/zork-fortran

(GNU fortran port: https://github.com/GOFAI/dungeon)

f2c translation (basis of many versions): https://github.com/devshane/zork

(See README for history of this version)