CodeSignal - CodeSignal is the leading assessment platform for technical hiring.

interviewing.io - Free, anonymous technical interview practice

hackattic - No nonsense, real world programming challenges

Coding View - Coding View is live collaborative coding environmentdesigned for technical phone interviews. It features web version of Visual Studio Code, as well as access to real terminal. It has a built-in compiler for most popular programming languages.

Codejudge - Automate tech hiring with simulated real world assessments

Qualified.io - Developer-friendly coding assessments