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


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.






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.

