Quizlet (web, iOS, Android) Flashcard creation starting with a simple online learning tool, Quizlet offers tools for students to make flashcards, practice spelling, play learning games, test their knowledge, collaborate with other students, and more.
StudyBlue (web, iOS, Android) StudyBlue is the largest crowdsourced study library, with over 400 million flashcards, notes and study guides for students. Make and share study materials, search for recommended study content from classmates, track progress, set reminders, and create custom quizzes.