THIS APP IS FOR ROOTED PHONES ONLY!
BusyBox is a software application that provides many standard Unix tools, much like the larger (but more capable) GNU Core Utilities. BusyBox is designed to be a small executable for use with the Linux kernel, which makes it ideal for use with embedded devices. It has been self-dubbed “The Swiss Army Knife of Embedded Linux”.
Link: market.android.com
SetCPU is a tool for changing the CPU settings (capable of overclock and underclock) on a rooted Android devices to improve performance or save battery.
SetCPU also allows you to set up powerful profiles to change the CPU speed under certain conditions, such as when the phone is asleep or charging, when the battery level drops below a certain point, when the phone’s temperature is too high, or during certain times of day. See the screenshots for examples of how you might set up profiles.
SetCPU’s wide feature set make it useful to beginners and enthusiasts alike. Accelerate your processor to unleash your phone’s multitasking potential, or dial your CPU’s speed down to save battery.
SetCPU also includes a “voltage control” menu, for use with certain devices with custom kernels that support it, to control undervolting to save even more battery. Keep in mind that undervolting is only available for certain kernels.
Link: market.android.com
Grant and manage Superuser rights for your phone.
This app requires that you already have root, or a custom recovery image to work.
Link: market.android.com
Rooting, for those of you that don’t know, means giving yourself root permissions on your phone. It’s similar running programs as administrators in Windows, or running a command with sudo in Linux. With a rooted phone, you can run more apps or install custom versions of the Android operating system. Note that there’s a big difference between installing a custom ROM on an Android phone and just rooting it. Custom ROMs may offer plenty of features that aren’t available direct from the manufacturer, but most of them can be added to a rooted phone by simply installing the right apps. That’s what we’re after today.
If you haven’t rooted your phone yet, but would like to know more about the process, be sure to check out our always up-to-date guide to rooting Android phones.
Link: LifeHacker