Sitespeed.io - how speedy is your website? 
Sitespeed.io is an open source tool that helps you analyze and optimize your website speed and performance, based on performance best practices rules.
The branches: master is the latest release, the wip-branch is the coming release.
Related projects:
- https://github.com/soulgalore/crawler - Crawler used to fetch the URL:s that will be analyzed
- https://github.com/soulgalore/xml-velocity - Used to convert the XML from Yslow to HTML
- https://github.com/soulgalore/doc.sitespeed.io - The documentation site
- https://github.com/soulgalore/delay - Delay your assets. Project used for testing if the sitespeed rules are working
See http://sitespeed.io for documentation.