Neutrino was my effort to make an Mac OS X multimedia TADS interpreter written in Cocoa. I have stopped working on it as of 2/2006. See the bottom of this page for details.
There are already a number of Mac OS X TADS interpreters. (Note I don't include command-line TADS interpreters here, only full GUI applications.)
QTads, written by Nikos Chantziaras and others, combines a command-line port of TADS called FrobTADS (also written by Nikos Chantziaras) with Trolltech's Qt to create a full-featured TADS interpreter. However, it doesn't display HTML-TADS, and, because it uses Qt, it doesn't feel entirely like a Mac app.
Cugel, by Tor Andersson, is a native Mac app, but hosts many different systems, not just TADS. So its level of UI detail and support is less for each system than it might otherwise be. It also doesn't display HTML-TADS.
Ben Hines's MaxTADS OS X port is interesting mainly for historical reasons. He "ported" Andrew Plotkin's MaxTADS to Carbon first, in 2002, but by "ported" I mean that he made the fewest changes possible to the codebase and resources so it would build and run as a Carbon application on 9 and X. Any of the other interpreters listed here has a much better user experience than this port does.
HyperTADS, maintained by Iain Merrick, does display HTML-TADS, but it is OS 9-only, and so can only be run on OS X under Classic. Classic, however, will not be present on Intel Macintoshes.
So if you want to run HTML-TADS games on your brand new Mac 1-2 years from now, none of the above will fit the bill.
Here's a screenshot:
Unfortunately, when I got around to New Year's resolutions for 2006, this project didn't make the cut.
I have archived all the files that I had when working on this project into a 93 MB zip file, Neutrino_1-29-2006_Archive.zip. Due to its size, please only download it if you are serious about contributing to this project. It includes all the Neutrino source plus, for convenience, all the other sources I used, including TADS 2, Boost, and the Membrane library. Plus it includes documentation and even some QuickTime movies that show some issues with the TADS engine. Finally, it includes a ReadMe file at the top level that should help anyone who wishes to take over the project to get started.