WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
iMobie PhoneRescue - PhoneRescue is a complete data recovery solution for all iOS and Android users. It offers both iPhone and Android data recovery with the world's highest recovery rates.
TreeSize - TreeSize tells you where precious disk space has gone to.
AnyTrans 7 - Smart way to manage all your iOS data and files
SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.
Primo iPhone Data Recovery - Recover 25 types of lost iPhone/iPad/iPod data & repair iOS system errors.