NetQin Mobile Manager will be a good call filter just for you. Block unwanted calls now and protect your privacy. Now with better developed features, you will no longer need to worry about privacy leak. Protect your private info 24x7.

Widget is lite, and dont dry your battery. The clock turns off with the screen when you turn off device.

The clock is also resistant to the task killer'y. Do not stop when you force stopping the application.

There are many applications that automatically start when you turn on your device; many of these you don't use or need, they just consume your valuable resources. Autorun Killer lets you manage applications that start up when you boot your device. Donate version even tries to prevent their restart (and is ad-free).

Fast Task Killer
Simply stop and kill unwanted applications and processes free up memory and increase your battery life

This is the Ultimate Application Killer. This app lets you kill running applications and system services. You can also back-up applications you’ve downloaded or uninstall them from your device.

Features include:
• Kill Running Applications
• Kill Running System Applications
• Hide Applications
• Uninstall Downloaded Applications
• Backup Applications

Appcombine - lightweight and simple app manager tool.

A task manager application which monitors running processess and their memory usage. Allows killing of selected processes and remembers previously killed processes.