Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.

Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.

CleverDeck - Learn languages more efficiently with spaced repetition

Flash Cards: Math - Simple and effective math flash cards

FlashcardX - Ai flashcard generator

Machine Learning Flashcards - 300 digital flashcards