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.
Livemocha - Livemocha is a web application that allows you to learn over 15 foreign languages free of cost.
Yozzi.com - Want to practice your writing skills in English? You can submit articles to Yozzi and receive feedback from native speakers. Yozzi welcomes guest interviews and guest posts, especially about language, culture, business and startups.
Bilingua - Bilingua: your language exchange app & learning companion.
Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
Mondly - Learn 33 languages in 500 bite-size lessons and 14 conversational modules.