Libretube is also great and true open source by definition. There is an issue for some people with grayjay license not being Libre, free open source. But it is very similar to open source, without commercial modifications.   I have added a comment in the post explaining more about it.

quark

opensource

Grayjay for watching videos and FutoKeyboard are great apps for Android

Thanks for the information. I have a graphene pixel and I really haven't found a good keyboard yet. I'm going to try Futo.  Grayjay sounds like it's worth trying too. I use libre tube, but this sounds like it has more options. 