NewPipe is a streaming application developed by Christian Schabesberger and F-Droid. This application is built as an alternative to the default YouTube application.
With NewPipe, you'll be able to access the same large YouTube library but you'll be able to use it with a better Android client. This client fixes many of the issues users have had in the past with the YouTube application like how much resources it takes, making your phone slow down. In addition to fixing performance issues, NewPipe comes with some unique features like being able to download any video available on YouTube.
In its current state, NewPipe is well worth using for any Android owner that regularly uses YouTube. Some users who like to queue up a lot of videos will only be disappointed by the lack of video history or recommended list inside this app.