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.
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Studies - Studies is a flashcard like application formerly known as Mental Case.
RemNote - All-in-One Tool For Thinking & Learning
Discovery FlashCards - Discovery FlashCards is a unique free program that can help you study.
WordsKeeper - Learn any language. Build and grow your own vocabulary. Keep words, phrases and notes in one place.