PagerDuty - Cloud based monitoring service
Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.
VictorOps - We make on-call suck less & help teams to solve problems faster.
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.
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
xMatters - xMatters transforms event data into intelligent communication IT teams, avoiding outages and disruptions