DaisyDisk - DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.

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.

CleanMyMac X - Clean, protect and speed up your Mac

DiskBoss - A file manager with a focus on storage side of things: Monitoring, classing, storage, duplicate...

MacFly Pro - Smart assistant for better Mac performance

RidNacs - RidNacs is a very fast disk space usage analyzer for Microsoft Windows.