GTmetrix - GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.
WebsiteSpeedAnalysis.com - Website Speed Analysis Tool
PageSpeed Insights - PageSpeed is addon for ...
SitePerformanceTest.com - Website Performance and Usability Test
DareBoost - DareBoost is an online tool to test, analyze and monitor your website: speed, SEO, quality, security. All you need for website optimization in a single service.
CheckPageSpeed.com - Website Speed and Performance Analyzer