Khan academy

https://www.khanacademy.org/ Founded:September 2008; 11 years ago Founder:Salman Khan Motto:A free, world-class education for anyone, anywhere. Khan Academy is a non-profit^[7] educational organization created in 2008 by Salman Khan with the goal of creating a set of online tools that help educate students.^[8] The organization produces short lessons in the form of videos.^[9] Its website also includes supplementary practice exercises and materials for educators. All resources are available for free to users of the website. The website and its content are provided mainly in English, but is also available in other languages including Arabic, Armenian, Bengali, Bulgarian, Chinese, Czech, Danish, Dutch, French, Georgian, German, Gujarati, Hindi, Indonesian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese (Brazilian and European), Serbian, Spanish, Swedish, Tamil, Telugu, Turkish, and Urdu.