Hi
TOEFL iBT is perhaps the only course which needs slightly complex software because some portions of it are what they call “integrated” with more than one skill being under test. Take the rest of the courses that have been mentioned, and one does not need to use any special software. In fact, for GMAT, the Official Guide can be used as the course material as long as an institution supplies each student, a genuinely bought original. It is a matter of time I suppose, when ETS also permits their official guide containing the software to be used as course material.
Even for TOEFL iBT, let us not be overly concerned by those so called softwares sold by the big names. Such software is required only in certain areas. After all, independent writing, speaking and reading sections do not need any special software. For Independent speaking questions, one can conduct classes through skype. For test practice, one can ask the student to buy a course book with the software.
But video - recorded coaching is an entirely different ball game from the online one-to one online coaching. I agree with you that no student will like the recorded coaching.
But let me assure that the same student will love skype based interactive, online live learning. A student wants to see his professor through the screen, his gestures and a professor wants to see his student and his body language and those stuffs are possible in online coaching in real time.
In all, let me reiterate that online coaching does not require sophisticated softwares but only sophisticated minds, whether individuals or institutions. That institutions are wanting in this arena, is a matter of another debate.