SkyTube is an app that lets you watch YouTube videos on your Android device without ads, sign-in, or Google services. It has some features that the official YouTube app does not have. Such as:

Video blocker: You can block videos or channels based on various criteria, such as language, views, or dislikes. Video downloader: You can download videos for offline viewing or background playback. Video bookmarks: You can bookmark videos for later watching or resume from where you left off. Video swipe controls: You can adjust the volume, brightness, comments, or description by swiping on the screen. Channel subscriptions: You can subscribe to channels and get notifications without a YouTube account. SponsorBlock: You can skip sponsored segments in videos.

SkyTube is a copylefted libre / open source software licensed under GPL-3.0. You can download it from its website or from F-Droid. You can also contribute to its development or translation on GitHub or Weblate.