O&O ShutUp10++

A focused little utility that flips off the dozens of Windows 10 and 11 telemetry and tracking settings Microsoft buries deep in menus, and it does that job cleanly and for free. The honest marks against it are that it is closed-source and Windows-only, so you are trusting a binary, and Microsoft can quietly reintroduce settings after updates. Worth running if you are stuck on Windows and want the data leakage dialed back; re-run it after big updates.