QTads
From IFWiki
QTads is a cross-platform, multimedia interpreter (as of version 2 onwards) for TADS games. It was created and is currently maintained by Nikos Chantziaras.
Both TADS versions in use today (TADS 2 and TADS 3) are supported. It supports all multimedia functionality of HTML TADS. It is mainly being developed on Linux and Mac OS X, but it should compile and run in many more.
See also: CocoaTADS, a similar program for Mac OS X.