CodeSignal - CodeSignal is the leading assessment platform for technical hiring.
hackattic - No nonsense, real world programming challenges
Takehome - Effective and humane coding challenges for candidates
JSPad.xyz - Collaborative code assessment platform for JavaScript devs
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Qualified.io - Developer-friendly coding assessments