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.
IceCream - Free up space fast and never miss a moment again
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Cisdem iPhoneCleaner - Safe iPhone cleaner to clean iPhone, iPad, iPod touch junks to free up space and backup iPhone Mac.
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.
iMyfone Umate - iMyfone Umate is an iPhone space saver which helps iPhone/iPad/iPod touch users free up iPhone...