Suprvise is a real-time health monitoring and errors tracking dashboard.
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.
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
MaaxMarket - Improve your sales by over 87%
Oh Dear! - Website monitoring, without the hassle
Freshworks - Delight your customers, from wherever you are
Monitority - Simple website monitoring service (sms/email alerts)