SwipeAway is a free and very simple Cydia tweak that let you allow to kill all running apps on your iDevice just through a swipe up/down from iOS App Switcher.
You just have to download and install SwipeAway by visiting “ModMyi” repo on Cydia, and then go to the “Settings” from Springboard of your iDevice and make settings to invoke the app killing feature of SwipeAway.
SwipeAway is certainly not the first Cydia tweak that kills background apps in iOS, but its method of doing so is quite intuitive.
Nice to kill apps with a swipe.