PocketTube - Group YouTube subscriptions into YouTube folder. Video Deck for Youtube. Mark as watched videos. Filter YouTube video. Youtube mode
Video Deck for YouTube - Control videos that are uploaded by your favourite YouTube channels.
Infstream - Infstream is a YouTube alternative with no adverts & no demonetization. Channels earn by charging $1 per month for access to their videos.
YouTube Vanced - Vanced is a modded version of YouTube with many features such as adblocking and background playback
NewPipe - NewPipe is a lightweight YouTube front-end for Android.
Captionfy.io - Captionfy is a free Youtube community captions platform with a subtitles/captions editor that you can use to create captions for any public Youtube video.