This jailbreak tweak allows iPhone users to dismiss any notification from the locked screen. Once Ipsum (from Cydia) is installed, all the user need do is swipe the notification... first right and then left... to dismiss it without unlocking the phone.
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2. AnyLockApp:
The AnyLockApp is a free Cydia tweak that allows the user to launch any application from the iPhone lockscreen.
The iOS 5 comes with the a locked-screen camera shortcut that is designed to give easy access to the camera. However, if the user does not use the camera as often as some other feature of the iPhone, AnyLockApp, with the help of a simple jailbreak, can tweak the existing shortcut to connect to any other frequently used app.
This jailbreak tweak, however, works only with the iOS 5 or higher.
3. F.lux:
F.lux is a screen-dimming app that adjusts the brightness of the iPhone screen, based on the time of the day. The app was actually originally developed for computers but has now been ported to the iPhones. Jailbreak your iPhone and install this free app to avoid straining your eyes.