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.

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

DiskWave - DiskWave is a free utility to help you determine where most of your hard drive space is consumed.

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

Duc - Duc is a collection of tools for inspecting and visualizing disk usage.

HDGraph - HDGraph helps you to free disk space : it finds for you the largest folders on your drive.