I used to use JiTouch which allowed you to draw a symbol with two fingers. I then bound each symbol to an app: C for chrome, T for terminal, F for Firefox, and

I used to use JiTouch which allowed you to draw a symbol with two fingers. I then bound each symbol to an app: C for chrome, T for terminal, F for Firefox, and so on. It was wonderful, but unfortunately development support of JiTouch stopped.