CodeChef

CodeChef is a non-profit educational initiative of Directi, a technology and web products company. It is a global competitive programming platform that started in 2009 and currently holds 4.6 lakhs registered users. It supports over 50 programming languages and has hosted over 1200 contests on its platform so far. With active users of around 3 lakhs, it binds together a large community of programmers that helps students and professionals test and improve their coding skills. Its objective is to provide a platform for practice, competition and improvement for both students and professional software developers.