Real Dev - Real-life coding skill challenge
100 Days of Code - Make coding a habit. Join the growing community.
hackattic - No nonsense, real world programming challenges
Enlight - Performance and Error Monitoring. We keep an eye on your applications and notify you about performance issues and errors.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Hack Club - Free and open source high school coding clubs 👊💥