JavaScript Quiz - Check your knowledge by having fun.
Hackr.io - There are tons of online programming courses and tutorials, but it's never easy to find the best one. Try Hackr.io to find the best online courses submitted & voted by the programming community.
The Ultimate GDPR Quiz - Learn how to get GDPR compliant in seconds
Programming Hero - Personalized, fun, and interactive way to learn programming
Triplebyte - Hire engineers by measuring their ability, not credentials
BigTube - Makes watching programming tutorials more fun