Been awhile since I saw a thread like this and they’re always good for at least one or two things I’ve never heard of before. Bonus points if the software is open source and cross platform. Extra bonus points if you link to where we can see it/get it.
My contribution: Destiny which is an anonymous, P2P, E2EE file sharing app - its basically a GUI for a Magic Wormhole implementation. Works on Linux (tarball or appimage), Win, Mac, Android (inc f-droid) and iOS. Only downside is it’s not been updated for 2 years.
For Windows users, I want to recommend PowerToys: https://learn.microsoft.com/en-us/windows/powertoys/
The “toys” that I use a lot are: PowerToys Awake: to keep my laptop awake even if I’m away from keyboard for a while.
Fancy Zones: to create my own layout of windows, especially on the ultra-wide monitor I have at work, it’s easy to have 3 smaller windows next to each other according to my layout.
Mouse Utilities, I often can’t find my mouse cursor, just pressing a hotkey will literally spotlight the cursor.
Quick Accent, especially for multi-lingual people this is really handy, though it takes a bit to get used to its working.