Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
TaskCall - TaskCall is an incident response and management service that helps organizations digitize their operations and reduce downtime costs to the minimum by mobilizing their response effort and streamlining stakeholder communication.
Monkey Test It - Primate powered algorithms that scan your site for common bugs and SEO mistakes.
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
Freshworks - Delight your customers, from wherever you are
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.