CodinGame is the gaming platform for programmers. Solve programming puzzles, improve your skills, share and have fun.
CodeChef is a global competitive programming platform which supports over 50 programming languages.
GitHub is where people build software. More than 19 million people use GitHub to discover, fork, and contribute to over 52 million projects.
A language-independent collaboratively edited question and answer site for programmers. Questions and answers displayed by user votes and tags.