Website Speed Test Tools
Page Speed Insights
PageSpeed Insights analyzes the content of a web page, then generates suggestions to make that page faster. Reducing page load times can reduce bounce rates and increase conversion rates.

Website Speed Check
The website speedtester shows the duration of a given website. This value can be used for showing how long a website take to load and if it is better to optimize the website.

Neustar Web Performance
Test your website performance with this free cutting edge tool. This tool accesses your website from different location and generates a website performance analysis report.

PingDom
The Full Page Test tool to help you analyze the load speed of your websites and learn how to make them faster. It examines all parts of a web page, shows performance overview and you can also share the results with your friends.

Load Impact
Load test your website online. We offer load testing and reporting as an online service to e-commerce & B2B sites all over the world.

Which Loads Faster
Pages compete head-to-head in your browser to see who’s fastest!

Octagate Site Timer
Web Monitor allows you to monitor how long it takes for a user to download one or more of your web site pages.

Show Slow
Show Slow is an open source tool that helps monitor various website performance metrics over time. It captures the results of YSlow, Page Speed, WebPageTest and dynaTrace AJAX Edition rankings and graphs them, to help you understand how various changes to your site affect its performance.

Web Pagetest
Run a free website speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds.

GTmetrix
GTmetrix uses Google Page Speed and Yahoo! YSlow to grade your site’s performance and provides actionable recommendations to fix these issues.

Source:
http://www.flashuser.net/resources/website-speed-test-tools.html