[Android app] SuperSU

SuperSU allows for advanced management of Superuser access rights for all the apps on your device that need root. SuperSU has been built from the ground up to counter a number of problems with other Superuser access management tools.

You can download the app directly on your device through the Google Play Store. You can also download the app using the following link

Download
Price	Free
Requirements	Android 2.1 or greater

SuperSU for Android has the following features:

• Superuser access prompt
• Superuser access logging
• Superuser access notifications
• Per-app notification configuration
• Temporary unroot
• Deep process detection (no more unknowns)
• Works in recovery (no more segfaulting)
• Works when Android isn't properly booted
• Works with non-standard shell locations
• Always runs in ghost mode
• Wake on prompt
• Convert to /system app
• Complete unroot
• Backup script to survive CyanogenMod nightlies
• Icon selectable from 5 options + invisible
• Theme selectable from 4 options

Once you have installed the app, you could also consider downloading the SuperSU Pro for Android ($2.49), which has the following additional features:

• OTA survival mode (no guarantees)
• Full color-coded command content logging (input/output/error)
• Per-app logging configuration
• Per-app user override
• Grant/deny root to an app for a set amount of time
• PIN protection
• Per-app PIN protection
• Adjust auto-deny countdown

source - XDA