There’s a few options
Newpipe, uses it’s own extractor, also can act as a player for SoundCloud and Peertube, there’s also a fork with SponsorBlock: https://newpipe.net/
Libretube, uses the Piped api, generally seen as the one with the best UI: https://github.com/libre-tube/LibreTube
Clipious, uses the Invidious api: https://github.com/lamarios/clipious
Could also watch videos in a browser from an Invidious or Piped instance I guess
And while I’m at it I’ll also mention there’s a client option on desktop too, Freetube: https://freetubeapp.io/
This sort of exists https://reactos.org/
Key word on sort of, it’s quite rough in many areas