SuperMakers - An indie game built with no code
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Indie Maker The Game - Open source game about indie makers
AlgoExpert.io - A better way to prep for tech interviews
CSSBattle - Play against others in golf with your CSS skills
Codility - Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.