QSwap

After running QSwap, on the screen are listed all the applications currently installed on your device.
On the top there is a button where you can turn ON and OFF the service.
If the mode is ON, you can select some of the applications that are listed just by pressing on a particular row.
After selecting your preferred applications, every time you move your hand (finger) across the phone's proximity sensor another application from the selected list is started. (Only for phones with proximity sensors).