programming

A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges.

Free Code Camp's open source community help you build a job-worthy portfolio of real apps used by real people, while helping nonprofits.

Begin interactive coding for free with courses in multiple languages, offering a fun learning experience enhanced by community support and optional pro features.

Achieve code mastery through challenge.

Download and solve practice problems in over 30 different languages. For code newbies and experienced programmers.

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