Tweak Name: KillBackground
Repo source: BigBoss
Price: Free Cydia Tweak
Requirements: iOS 4.0 or higher
KillBackground is a free Cydia tweak for jailbroken iPhone/iPad users that lets you instantly close or “kill” all of your backgrounded apps that sit in the multitasking App Switcher/Drawer. You can invoke KillBackground by turning on the optional kill switch in the settings or by setting an Activator method of your choosing.
To get started just download KillBackGround available in Cydia in the BigBoss repo. Once downloaded you will see a small red skull in the AppSwitcher view, just tap and its done. All your background running apps will be closed or lets say all background apps will be killed.
So if your one of those people who open many apps and just want to close all of them with one tap, so go ahead and get KillBackGround Cydia tweak
There are no new icons added to your SpringBoard with this tweak and KillBackground settings can be configured in your main Settings app.