Microsoft PowerToys
FreeMicrosoft's official power-user toolbox for Windows
Open Source No Ads No Sign-up Offline
A whole suite of system utilities in one app — FancyZones window management, PowerRename, Color Picker, Command Palette and 25+ more. Open sourced by Microsoft itself, completely free.
Why we picked it
PowerToys is the official patch for the Windows experience. Microsoft bundled all the features the OS "should have had" — grid window layouts, batch regex renaming, on-screen color picking, a keyboard launcher — into one actively-developed open-source app.
No ads, no subscription, no account. Install and go. For anyone who lives in Windows it's a near-mandatory install. You won't use every module, but a few will quietly become part of your daily muscle memory.