As well as wind and drum controllers, there are guitar controllers, such as the Roland GR units.
Computers are often midi controllers. If you can download a .mid file and play it on your computer, there is some kind of controller in there. Midi can also be used to sync machines together. Example, I can match my Lexicon effects unit bpm to the bpm of a song on my computer so that the echoes and delays and such play in time to my song. I can use midi to change effects midsong etc.