Programming Hero - Personalized, fun, and interactive way to learn programming
JavaScript Quiz - Check your knowledge by having fun.
Code4Startup - Learn Ruby on Rails, Python, AngularJS, NodeJS, React, Ionic by cloning AirBnb , TaskRabbit, Tinder, Product Hunt, Fiverr and . more.
The Ultimate GDPR Quiz - Learn how to get GDPR compliant in seconds
Practice.dev - Practice programming for free
Triplebyte - Hire engineers by measuring their ability, not credentials