PagerDuty - Cloud based monitoring service
Squadcast - Automate incident response, reduce downtime and enhance your tech teams’ delivery with a unified platform.
OpsGenie - Alerting and On-Call Management for Dev&Ops Teams
PagerTree - On-Call. Simplified. PagerTree empowers teams to share oncall responsibility and respond faster when incidents occur.
OnPage - OnPage critical alert and incident management system enables rapid resolution of critical IT, healthcare or IoT incidents through efficient communication.
Cabot - Self-hosted, easily-deployable monitoring and alerts service - like a lightweight PagerDuty