One website with lots of great technologies and computer programs for working on speech problems (e.g.,articulation, intonation, volume, initiation) is Dr. Speech.
This site takes you to the program called Dr. Speech 4, their home page lists others. The receptive aspect of speech can be addressed using programs such as Earobics, FastForward and other similar speech sound computer software that improve comprehension/listening skills typically associated with Dyslexia. This can also be impaired in Autism, however, the issues are often more in the interpretation of speech cues with respect to their social rather than linguistic meaning. Students with autism will have difficulty in expression as well, for which Dr. Speech and a good OT/SLP therapist is vital.
In the motor planning area, there are also a number of tools available. Certainly accessibility is key, so having appropriate switches and input devices for your computer is important. A website to help make such decisions is Http://techmatrix.org