Decks - Decks is a study application designed to keep all your stuff in one place, instead of having an app for flashcards, another for notes, and one to watch tutorials, create a deck and keep everything organized there.
Academus - Read research papers as interactive webpages
Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.
Localingual - Listen to the voices of the world
Shrink.media - Reduce the file size of your images by smartly compressing & reducing dimensions.
Machine Learning Flashcards - 300 digital flashcards