Mochi - Write notes and flashcards with Markdown and study them with spaced repetition.
Stories - Master complex materials through short daily stories.
Harken - Flashcard app using smart repetition to improve your memory
Glean.co - Personalized learning for educational video lessons
Cloudbite - Bite-sized cloud learning with spaced repetition
SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.