There are better, but they all cost. In fact, I can't find a single free serial terminal package for the classic Mac OS.
There is Zterm, which is shareware.
Then there is Apple's own MacTerminal, Microphone, and the terminal software built in to the "Works" packages, ClarisWorks and Microsoft Works.
Those are the only ones I can think of. All paid software.
works great for that task.