Selenium : Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testin...
tracing-framework : Rich tools for instrumenting, analyzing, and visualizing web apps.
Babel : Babel will turn your ES6+ code into ES5 friendly code, so you can start using it right now without waiting for browser support.
SlimerJS : A scriptable browser for Web developers