Flashback is a MERN, spaced-repition flashcard app, designed with teachers in mind.
It uses a spaced repetition system, similar to programs like Anki, to optimise retention.
It has a 'user' side, where users can drill their cards, as well as add/remove/edit cards.
And an 'admin' side, where an admin - for example a teacher - can see their students' progress and add cards to their decks, either individually or in bulk.
For instance, a language teacher could push lists of vocabulary to their students' decks after each language class.
Name kindly suggested by @NeRegretteRien on Twitter.