BusyBox

https://play.google.com/store/apps/details?id=stericson.busybox

説明

The fastest, most trusted, and most popular BusyBox installer and uninstaller! Over 2.2 million installs! Winner of best Utility Software award for Android via Handster. This is the ONLY Installer on the market that will allow you to remove Busybox (If supported on your phone), the only open sourced installer, and the only installer that is ad free!

Source: https://code.google.com/p/busybox-android/
Featured on the BusyBox website at: http://busybox.net/products.html
The BusyBox source code can be found here: http://git.busybox.net/busybox/