Spatterlight is a native Cocoa application plays most kinds of interactive fiction game files: AGT, Adrift, AdvSys, Alan, Glulx, Hugo, Level 9, Magnetic Scrolls, TADS (text-only), Quill, and Z-code (except v6).
Spatterlight also supports the Treaty of Babel standard for cataloguing bibliographic information about interactive fiction.
The Spatterlight application is released under the GNU Public License; the interpreters and libraries it uses are freely redistributable and covered by their own specific licenses.
Look at the screenshots here.
This is beta software! There is no warranty: use it at your own risk. It is a Universal application. You will need Mac OS X 10.3.9 or higher.
The 0.5.0 release doesn't work properly with more recent macOS versions.
You can find an updated version of Spatterlight on github.