Clean Master: One of the Most Useful Free Android App I Have Ever Come Across

Freeing up disk space in Ubuntu might be easy. I haven't thought much about doing the same in Android yet though. Clean Master not only has one of the cleanest of designs, it works really well and the app itself is completely free too.

Clean Master: Freeing up Disk Space in Android Made Easy
Clean Master can liberate space in your Android device that you're otherwise unaware of. Some of its most important functionalities include:
  • Clearing of history made easy using a new algorithm released to detect and clean popular apps cache. Currently supported apps include Whatsapp, Spotify, Pinterest etc.
  • Removing of residual or left-over files after an app is uninstalled. 
  • Task killer to free up your RAM.
  • Finding and removal of APK files after app installation.