5 of 8Image
Platform: Samsung Android
This app is incredibly useful, but only if you have a Samsung Android device. By default, the TouchWiz theme on Android sorts apps in the "All Applications" grid by installation date. After a while, this means that any alphabetisation of the grid is sorely lacking, and iOS-like "Where'd that app go, wait, I'll just search for it" userflow kicks in.
All this app does is re-sort the applications grid, and in doing so restores order from chaos, and that is what makes it brilliant.
There is also a paid version for AU$0.99 to remove the standard annoying ads found in many Android apps.