Livemocha - Livemocha is a web application that allows you to learn over 15 foreign languages free of cost.

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.

Bilingua - Bilingua: your language exchange app & learning companion.

Kanji Book - Learn Japanese online with kanji mnemonics. Study all of the jōyō kanji with the best spaced repetition system. It's easier and better than any flashcard app.

Mondly - Learn 33 languages in 500 bite-size lessons and 14 conversational modules.

Repetitions - Repetitions is a cross-platform spaced repetition system (SRS), an intelligent flashcard application that makes learning and memorization easy.