Zabbix - Track, record, alert and visualize performance and availability of IT resources
StatusPage.io - StatusPage.io is the best way for web infrastructure, developer API, and SaaS companies to get set up with their very own status page in minutes. Integrate public metrics and allow your customers to subscribe to be updated automatically.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Status.io - Status.io is a platform for system status pages and status notifications. Companies rely on Status.io to track outages, schedule planned maintenances, broadcast status notifications, and much more; and their customers love the transparency.
Prometheus - An open-source systems monitoring and alerting toolkit.
StatusCast - A hosted status page by StatusCast lets you communicate service downtime and website maintenance to your employees and customers. ✓ Start your trial today!