The other is called Dynasplint, which was said to be better than Therabite, although I never used either. I've used tongue depressors too, and manual manipalation with my fingers by crossing my index finger and thumb, placing the thumb on the top teeth, and index finger on the bottom teeth, and slowly stretching, holding, repeat several times.

There is another type of acrylic resin "cork screw' devise for trismus that didn't look too friendly for my teeth, and invisioned it getting stuck too, so I never used it either.