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Yasminoku - Sudoku game and solver totally written in DHTML.
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.
HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
nsudoku - A Sudoku game made with ncurses.
Busuu - Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .