Desktop:
- Pi-Hole (network wide adblocking)
- AdGuard (device wide adblocking)
Web browsers:
- uBlock Origin
- uMatrix (not developed anymore but still works, can also use NoScript)
- SponsorBlock (blocks in-video sponsor segments, intros, outros, filler tangents, etc in YouTube)
Mobile:
- Firefox for Android / Kiwi Browser (both have web extension support so you can install uBlock Origin)
- YouTube Vanced (alternate YouTube app blocks ads, also has SponsorBlock)
- NewPipe (alternate YouTube app blocks ads, also has SponsorBlock via a fork [0], different UI than main YouTube app)
- YouTube++ (for iOS, similar feature set as Vanced)
TV:
- SmartTubeNext (ad-free YouTube)