There's also LinuxGameCast but I don't really like some the opinionionated bs I've heard in their streams. I'm not really watching them though so I can't speak for the show in general.
There are lots of nice youtubers though. Most of them do benchmarks or single showcase videos so I'll just list the ones doing gameplays and series first or at least the ones having a few non-single gameplay vids (some of those might also stream in youtube/upload streams on youtube or other services):
Other channels:
A favourite one about benchmarks and radeonsi/gallium-nine related things: https://www.youtube.com/channel/UCh1UanySk_Ht0WRfo4O9STw