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adding mine

TreeSize (to easily find out what is consuming disk space)

picpick/ shareX (screenshotting with annotationsand autosave)

pdftk (pdf merge, split, crop, interleave(

ffmpeg (video trim, split, re-encode, etc.)

Lossless cut (GUI for ffmpeg trim and extract/add tracks)

OpenShot video editor (when DaVinci Resolve is too much for the job and you need simple edits and effects)

OBS Studio (screen record, stream to youtube)

Wiztree is a good alternative to Tree size, it's almost instantaneous

Or the good (old) Scanner from http://www.steffengerlach.de/freeware/ (a <1MB executable)

Not sure why you're being downvoted.

WinDirStat (which used to be my goto) took over 6 minutes and ate 625mb of ram.

TreeSize Free took over 30 seconds, I'm not sure how much ram as it doesn't report it. It also kept trying to upsell me.

WizTree took less than 8 seconds. What's wrong with it?

edit: 2tb nvme ssd, mostly full of rubbish, windows 10.

Directory Report has a 64bit version so that you can scan millions of files without running out of memory

wow it's even fast at samba shares, that's amazing. The NAS did sound like it was having a seizure, though.