BlueJ is an integrated development environment (IDE) for the Java programming language.

Codecademy is an online interactive platform that offers free coding classes in 12 different programming languages.

Codelearn helps you learn Ruby On Rails by creating an app right In your browser.

Nettuts+ is a popular site aimed at web developers and designers offering tutorials and articles on technologies, skills, and techniques.

Scratch is a free programming language and online community where you can create your own interactive stories, games, and animations.

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

Code.org includes free coding lessons and the initiative also targets schools in an attempt to encourage them to include more computer science classes in the …

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

freeCodeCamp (“Free Code Camp”) is a nonprofit organization that consists of an interactive learning web platform, an online community forum, chat rooms, Medi…

Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.

Spoj is an online judge system with over 315000 registered users and over 20000 problems.

Tutorialspoint provides free tutorials online.