Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
WebGazer - Monitor your website's availability with WebGazer, review its performance and get instant notifications when your website goes down. No installation required and free plan available.
UptimeRobot - Free Website Uptime Monitoring
LightStep - We deliver insights that put organizations back in control of their complex software apps.
Simple Ops - Simplify website performance and uptime monitoring with alerting, ssl check, chrome ux metrics, multi locations
PingPing - A simple tool to monitor your website and SSL