Browser Calories : The easiest way to measure your performance budget.
Phoenix : Phoenix is a web development framework written in Elixir which implements the server-side MVC pattern. Many of its components and concepts will seem f...
Yellow Lab Tools : Online test to help speeding up heavy web pages
webhint : webhint is a linting tool that will help you with your site's accessibility, speed, security and more, by checking your code for best practices and co...
Phantomas : PhantomJS-based web performance metrics collector and monitoring tool
It displays a menu with links that load other bookmarklets including Firebug Lite, Page Resources, DOM Monster, SpriteMe, and CSSess. The Mobile Perf menu is updated as new bookmarklets are released - so you get the latest tools automatically.