Watchdog Task Manager - Watchdog is a replacement for task killers. Most of the times you don't actually need to stop a process in order to make your phone run faster. Even if a program is running in the background, it doesn't necessarily mean it's eating up CPU.
Watchdog monitors running apps and steps in when an application becomes a resource hog
Back Button Gesture Launcher - Back Button Gesture Launcher is a handy application that simplifies the way you use your Android smartphone or tablet. The app allows you to quickly open apps installed on your mobile device and perform frequently used actions using touch gestures
e-Mobile GTask -
Manage your busy life with e-Mobile GTasks, powered with intuitive interface and simple click operations.
Easy collapse & expand to better organize tasks