HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Simple Poll - The easiest way to create polls in Slack
iMocha - Make intelligent talent decisions.
GitHub Polls - Polls for GitHub issues and readme
Codility - Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.
minipoll - Create simple shareable polls in seconds