WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
iToolab FixGo - When your iOS device gets stuck on the white/black screen, Apple Logo, Recovery/DFU Mode, restart loop, is bricked, as a frozen screen or simply won’t start, iToolab FixGo is the ideal solution for you.
TreeSize - TreeSize tells you where precious disk space has gone to.
iMyfone iOS System Recovery - Totally Repair Your iOS System without Data Loss
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.
FoneDog iOS Data Recovery - Recover photos, videos, contacts, messages, call logs, and more from iPhone, iTunes and iCloud.