SequoiaView - SequoiaView is a featured rich application that comes with the visualization technique to provide you a single view of files and documents that are stored in your hard drive.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
DiskBoss - A file manager with a focus on storage side of things: Monitoring, classing, storage, duplicate...
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
DiskWave - DiskWave is a free utility to help you determine where most of your hard drive space is consumed.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.