WebScarab : WebScarab is a framework for analysing applications that communicate using the HTTP and HTTPS protocols.
Phantomas : PhantomJS-based web performance metrics collector and monitoring tool
Sitespeed.io : Sitespeed.io is an open source tool that helps you analyze and optimize your website speed and performance based on performance best practices. It col...
tracing-framework : Rich tools for instrumenting, analyzing, and visualizing web apps.
The coach helps you find performance problems on your web page. Think of the coach as a modern version of YSlow. The coach will give advice of how your page can be faster.