As of May 2015, Browsermob is dead.
"Website monitoring for the masses. From basic free plans to enterprise level solutions, BrowserMob has it all - try our FREE website monitoring performance test.".
United States
UptimeMate Alternatives
UptimeMate is described as 'Helps you to find technical issues on your websites and makes sure that you are the first to know' and is a website monitoring tool in the network & admin category. There are more than 100 alternatives to UptimeMate, not only websites but also apps for a variety of platforms, including SaaS, Windows, Linux and Mac apps. The best UptimeMate alternative is Uptime Kuma, which is both free and Open Source. Other great sites and apps similar to UptimeMate are Tianji, UptimeRobot, Pingdom and WebSite-Watcher.