CodeHS is an interactive online learning platform offering computer science and programming instruction. ...more

CodinGame is an online platform for developers to play with programming with increasingly difficult puzzles, to learn to code better with an online programming application. ...more

Treehouse is an online school that teaches technology. Treehouse has courses on hundreds of topics. ...more

Moodle is a free and open-source software learning management system written in PHP and distributed under the GNU General Public License. ...more

TED-Ed is an online QnA site. ...more

Udemy.com is an online learning platform. It is aimed at professional adults who want to add new skills to their resumes, or explore their passions. ...more

Tutorialspoint provides free tutorials online. ...more

Microsoft Virtual Academy offers hundreds of free courses for anyone interested in improving their computer or IT skills. ...more