Not a channel, but some resources. The addons are all open source. Also unfortunately many subreddits that had quality channel suggestions have been either banned due to being “unmoderated” or are lost to time. Please post any finds here or help archive them if you can. The Datahorders community is a great place to start!

• DeArrow - Better Titles and Thumbnails on YouTube
• Sponsorblock
• Return YouTube Dislikes
• uBlock Origin

List of resources to find more gems. Note many posts and subreddits have been lost/banned/removed. Here are the ones I found.

• https://old.reddit.com/r/mealtimevideos/
• https://old.reddit.com/r/WoahTube/
• https://old.reddit.com/r/TheWayWeWereOnVideo/
• https://old.reddit.com/r/DeepIntoYouTube/
• https://old.reddit.com/r/Documentaries/
• https://old.reddit.com/r/ObscureMedia/