Software Developed by Kingsoft Inc
Kingoroot v.1.2.8
Kingo Android Root. It's free, and based on my initial tests with a Virgin Mobile Supreme, it works like a charm.
King Root v.4.0.2
Kingroot apk is a free user-friendly Android rooting tool. King root download supports MediaTek processor powered Android smartphones and tablets. Kingroot allows rooting Android devices without installing custom recoveries and CWM.