https://windirstat.net/download.html (https://windirstat.net/download.html)
Nice tool to check folder sizes.
Yes it is very handy. I have used the portable version for many years.
https://portableapps.com/apps/utilities/windirstat_portable
Also a good site, and as the name implies portableapps can be installed on a USB and run leaving no traces, or very minimal, on the system.
However the most used tool now is SwiftSearch - the speed this has searching a NTFS formatted drive is just astounding. Open source too.
https://sourceforge.net/projects/swiftsearch/
John Z
Another file search tool : Everything
QuoteLocate files and folders by name instantly.
https://www.voidtools.com/
That Everything works fine and was updated recently.