VB-CABLE, virtual audio device. Win10 allows you to adjust volumes of individual programs but I still prefer the virtual cable for convenience (e.g. sending all non-voice audio to it).
Workrave, for reminders to take breaks (mitigate eye strain, RSI, etc. I actually fell out of the habit of using this because it's incompatible with my activities. One Sec somehow fills in this gap though).
VSCodium, the version of VSCode that doesn't have the Microsoft telemetry BS.
ShareX, a thing that does many things but I use it primarily for quickly sharing clips/pictures, all uploaded to Horizon.