Imoblife

Price: Free (basic version), $2.99 (Full version)

Memory Booster kills any running apps that aren't necessary. Like Android Assistant, it features a Quick Boost button that automatically chooses the apps to kill; you can also manually select which processes or apps you want to get rid of. However, Memory Booster has an extra added attraction: it lets you add user and system apps to a white list so they won't be accidentally killed.

The full version of Memory Booster ($2.99) adds the ability to schedule the killing of apps. You can choose the interval at which to kill them, set the memory threshold if you only want it to kill them when memory is running low, and set it to kill them every time you lock your device. The full version also adds another, more aggressive level that can help free up even more memory by killing more apps.