UptimeRobot - Free Website Uptime Monitoring
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.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
PageSpeed Insights - PageSpeed is addon for ...
Pingbreak - Pingbreak is an original and free monitoring service.
WebPagetest - Run a free website speed test from multiple locations around the globe using real browsers...