Spatterlight
Description:
Spatterlight is a unifed IF interpreter for Macintosh OS X (Cocoa). The author and maintainer is Tor Andersson.
Spatterlight combines the abilities of many interpreters and is able to play games targeted for the following platforms: ADRIFT, AdvSys, AGT, Alan, Glulx, Hugo, Level 9, Magnetic, TADS 2 , TADS 3, and Z-code(except version 6). HTML TADS is not supported yet (text only).
This makes it a good all-purpose interpreter that can play virtually all interactive fiction that is supported on the Mac.
(Source: IFWiki)