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.

OpenStudy - OpenStudy is a social learning network where students ask questions, give help, and connect with...

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

ProProfs Flashcards Maker - ProProfs Flashcards Maker is a popular tool to create memory aids and review facts.

Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.

Kids Flashcards - Kids Flashcards offers free printable flashcards for kids, parents, and ESL teachers of preschool, kindergarten, primary and secondary education. 1300+ picture card are available for learning English, French, Spanish, German, Chinese and other langs.