SLAG: A Z-Machine Hint System, by Brian Hall.
SLAG compiles hint source files into Inform source, which can then be compiled to give a Z-code file containing Invisiclues style hints.
Invisiclues for Deadline.
Invisiclues for Enchanter.
Invisiclues for the Hitch-Hiker's Guide to the Galaxy.
Invisiclues for Hollywood Hijinx.
Invisiclues for Leather Goddesses of Phobos.
Invisiclues for Lurking Horror.
Invisiclues for Planetfall.
Compiler for the SLAG Hint System, version 8, written by Brian Hall. The SLAG compiler is a PERL script which converts SLAG source into Inform source. Also included are vi macros to help when creating SLAG files (also by Brian Hall), and a Gawk script for converting Invisiclues to SLAG format, by Fredrik Ramsberg.
Invisiclues for Sorcerer.
Invisiclues for Spellbreaker.
Invisiclues for Starcross.
Invisiclues for Stationfall.
Invisiclues for the Swedish game Stuga. Clues written by Fredrik Ramsberg. (the game is in games/zcode/swedish/Stuga.zblorb)
Invisiclues for Suspended.
Invisiclues for Trinity.
Invisiclues for Wishbringer.
Invisiclues for Zork 1.
Invisiclues for Zork 2.
Invisiclues for Zork 3.
Invisiclues for Zork: The Undiscovered Underground.