Together with the intrepid Steven Marsh, I ported the Invisiclues (hints) for all Infocom's text games to z-code. This was a major undertaking, so we figured it deserved a name of its own. Steven came up with Pretty Reliable Invisiclues for the Z-Machine, or PRIZM for short.
The invisiclues files are available separately and in various combinations from the PRIZM web site.