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.

Avokado - Language learning app

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

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