FreeTube - FreeTube is an open source desktop YouTube player built with privacy in mind.
Mashs and the Bear - Mashs and the Bear developed and published by 01Digital for Android and iOS devices.
NewPipe - NewPipe is a lightweight YouTube front-end for Android.
YouTube Kids - YouTube for the youngins on iOS and Android
Minitube - Minitube is a YouTube desktop application.
BabyFirst - BabyFirst: Education Songs, Games, and TV for Kids is a safe and fun way for kids to sprout, start learning, and explore.