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  1. This compact utility displays real-time CPU, RAM and disk drives usage meters right on the taskbar notification area, or next to the system clock, that is always visible.
  2. Folder Size analyzes your hard drives and displays file and folder sizes so that you can easily check the distribution of your disk space.
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  3. Disk Space Fan is a powerful disk space analysis tool for Windows and it is a freeware. It helps you to free up disk space by quickly finding and deleting big, useless files. It displays disk space usage with a nice chart. You can navigate the folders easily with the chart.
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  4. DiskWave is a free utility to help you determine where most of your hard drive space is consumed.

    Discontinued

    The program seems to be dead, as announced in a tweet of the author: https://twitter.com/bartheph/status/742596462807265280 . The website and the changelog look abandoned. Last version, 0.4.3, released by the end of 2015, can be still downloaded from the official website.

  5. Free open-source cross-platform file & directory statistics as found on Github - Generate a directory tree for any given folder - View any folder as colored rectangles (squarified algorithm) - Customize the rectangle colors and show statistics about filetypes - Export...
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  6. Pretty fast disk usage analyzer written in Go. Gdu is intended primarily for SSD disks where it can fully utilize parallel processing. However HDDs work as well, but the performance gain is not so huge.
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  7. DiskSavvy is a free, fast and easy-to-use disk space analyzer utility allowing one to analyze disk usage in one or more disks, directories, network shares and/or NAS storage devices.
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  8. Following a simple scan, Space Gremlin provides you with an easy to navigate and readable view of your file system. You can quickly determine which files or folders are eating up the most space and target them for deletion.
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  9. Disk analyzer pro is the best disk space management software and storage analyzer which helps in managing and handling hard disk space and running your PC with the highest speed.
  10. A macOS system monitor on your menubar. • Simple • A system monitor on your menubar. No complicated menus or configuration. • Lightweight •
  11. Duc is a collection of tools for inspecting and visualizing disk usage. Duc scales quite well, it has been tested on systems with more than 500 million files and several petabytes of storage.
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  12. UtilStudio Disk Space Finder is a simple tool that you can use to find the files that occupy the most space on your computer. The application can scan any folder and display the file size, while also enabling you to preview the selected files.
  13. Folder Size Catalog provides at-a-glance view of your folders and folder sizes so that you can easily check the distribution of your disk space. Fast search and index Fast and efficiently searches through folders and recursively through all component subfolders.
  14. Program to view and print directories tree.
  15. i.Disk scans directory trees and displays the total space used by each directory in an easy to use form.