TestDome | Automated Pre-employment Skill Testing

Discover a wide selection of tests: programming languages and frameworks, sales, customer service, finance, general aptitude, and much more. [link]

Devskiller: Developer screening & technical interviews platform

Devskiller is a tech sourcing, screening, and skill mapping platform powered by RealLifeTesting™. [link]

Codility: Tech Recruiting Platform, Online Code Testing

Codility is a software platform that helps technical recruiters hire and train stronger engineers. [link]

Qualified.io: 

Identify the best technical candidates faster withCode Assessments and Pair-Programming Interviews [link]

HackerRank: 5 million users

Standardize technical recruiting, increase candidate quality, and recover valuable engineering time [link]