Tasker - Tasker is an application for Android which performs Tasks (sets of Actions) based on Contexts...
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
AutomateIt - Automate Your Android!
WizTree - WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.
Locale - Locale helps content owners and translators work together, so Rails developers are free to write more code
TreeSize - TreeSize tells you where precious disk space has gone to.