*Easy GUI to set frequencies, [http://forum.xda-developers.com/showpost.php?p=27955261&postcount=1 governors] and [http://forum.xda-developers.com/showpost.php?p=23885668&postcount=1 I/O schedulers] (Links on XDA)
*"Safety Valve"to avoid boot-loops in case of unsafe settings (enabled by default)
*Stats screen to see the effective usage of frequencies
Requires root:Yes. The files in question are in /sys and /system.