Space Manager Tools

• WinDirStat
• TreeSize Tool
• SpaceSniffer
• Windows Storage Usage Tool Is Built In
• Reference

WinDirStat

• WinDirStat is a disk usage statistics viewer and cleanup tool for various versions of Microsoft Windows.
• For Linux, you are looking for KDirStat (apt-get install kdirstat or apt-get install k4dirstat on Debian-derivatives) or QDirStat and for MacOS X it would be Disk Inventory X or GrandPerspective..
• Its interface allows you to see exactly what’s using space on your hard drive at a glance.
• you can download a portable version of WinDirStat from PortableApps.com if you’d like to take it with you and use it on various PCs without installing it first.
• WinDirStat doesn’t offer a portable app on its website
• WinDirStat is a free and open-source graphical disk usage analyzer for Microsoft Windows
• WinDirStat
• WinDirStat - Wikipedia

TreeSize Tool

• TreeSize Free is a good alternative to WinDirStat. It's simpler
• The disk space manager TreeSize Free tells you where precious disk space has gone.
• TreeSize is a disk space analyzer written by JAM Software.
• TreeSize has native 32 and 64-bit support for all Windows versions and client/server versions currently supported by Microsoft
• TreeSize
• Microsoft-TreeSize
• TreeSize - wiki

SpaceSniffer

• SpaceSniffer is a freeware computer disk space analyser from Uderzo Software for Microsoft Windows platforms
• It uses a treemap to visualise disk usage.
• SpaceSniffer doesn’t have the directory list included in WinDirStat
• It’s just a graphical view that displays folders and the files in them by relative size
• SpaceSniffer - wikipedia

Windows Storage Usage Tool Is Built In

• Settings > System > Storage and click a drive
• It's good for a quickly understanding of disk usage and freeing space quickly
• Free up drive space in Windows
• Windows storage usage tool

Reference

• The Four Best Free Tools to Analyze Hard Drive Space on Your Windows PC
• Windows storage usage tool
• TreeSize