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Invidious: an alternative front-end that is open-source and privacy-respecting. Here are a list of open instances. If you are reasonably familiar with docker/self-hosting you can also host it yourself, but be aware it’s somewhat resource- and maintenance-heavy.
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yt-dlp: this is a nice command-line program that allows you to download YouTube videos by link; also works with Peertube links. For Windows/Mac users apparently the program is available as well, but please follow their instructions. If you also have mpv installed, you can call
mpv <http://youtube.link>
to directly stream a video. -
NewPipe: this app on F-droid.org allows you to watch YouTube videos (and Soundcloud/Bandcamp but somewhat glitchy) with an experience very much akin to the YouTube app itself.
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(edit) As suggested, things that I missed: Piped, LibreTube (Android)
Please feel free to share other alternatives.
I’m using SmartTube on my TvBox and live in fear it will stop working xD
There’s also a component for foobar2000 (yes, I’m GenX) called Youtube Source. You can search content, add results to foobar playlists and see the video (embedded in the skin or on a different window). Sometimes the video doesn’t load but restarting foobar it’s usually enough.