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.
QkMath.com - Mathematics For Everyone
NekoCap - Video & Movies
Kidy King Games - Kidy King Games: Educational Games for Kids
Hierogly.ph - Youtube transcription app. Made by @_nd_go and @FoolAllTheTime.
Kokotree Preschool App - Safe Preschool Learning: Cartoons, Games & Worksheets!