I’ve now found two different ports of TADS to Unices, FrobTads (for versions 2.5.17 & 3.1.3) by Nikos Chantziaras, and TADS Unix (for versions 2.5.9 & 3.0.8) by David Baggett et al.
FrobTads seems to include ports of the interpreter(s), frob, the T2 compiler, tadsc, and the T3 compiler, t3make, but nothing else.
TADS Unix includes ports for the interpreter(s), t23run, the T2 compiler, tadsc, the T2 debugger, tdb, and the T2 resource manager, tadsrsc, but leaves the last out of the makefile. It also has ports of the T3 compiler, t3make, and the T3 resource manager, t3res, but leaves out the T3 debugger.
It looks like if you want the most recent versions of all the available TADS tools, you’ll need to build both ports, so you get the T2 debugger and the T2 and T3 resource managers from TADS Unix, along with the newer compilers and interpreters from FrobTads.
Also, the source-code archive for FrobTads on the IF-Archive is corrupted, so you’ll have to pick it up from the TADS page or its home page.