Suprvise is a real-time health monitoring and errors tracking dashboard.
Monitority - Simple website monitoring service (sms/email alerts)
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.
PingPing - A simple tool to monitor your website and SSL
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Monitoro - Monitor webpages and get fresh data sent to your webhooks.
Oh Dear! - Website monitoring, without the hassle