All Things Devours, by "half sick of shadows" (Toby Ord), Release 3 / Serial 050325.

Public domain. From the author's own source code (IF Archive,
games/source/inform/devours.inf), lines 7-10:

  "This program was written by Toby Ord (half sick of shadows) and has been
   released into the public domain, so you are legally free to be distribute
   and modify it as you see fit."

And from the game's in-game credits: "No rights are reserved by the author:
this work is in the public domain and may be freely copied and modified."

Story file: https://ifarchive.org/if-archive/games/zcode/devours.z5
Source:     https://ifarchive.org/if-archive/games/source/inform/devours.inf

The interpreter in interpreter/ is Parchment (MIT, Dannii Willis);
see interpreter/LICENSE-parchment.txt.