Website Grader - Grade your website's strengths and weaknesses in seconds.
Pixpie - Optimize your images and speed up your site on WordPress
PageSpeed Ninja - One-click page speed boost for WordPress
Website Image Speed Test - Beautiful & easy free analysis of the images on your page
WebSite Auditor - The techie's SEO spider: find site issues other tools miss
OptimizeWP - WordPress speed optimization and maintenance service