Tongue Drive System in development; yes, it's SFW
There are some control systems already on the market that use the tongue, and the military is researching using it as a “sixth sense” for pilots. The newest system for tongue-based navigation uses an implanted magnet, the position of which serves as essentially an analog control for movement, orientation and so on. It’s still at a very early stage, but it sounds like a promising technology and is already attracting grants. I was going to make some inappropriate tongue-related jokes here at the end, but I don’t have the heart.