NewRelic - New Relic is a Software Analytics company that makes sense of billions of metrics across millions of apps. We help the people who build modern software understand the stories their data is trying to tell them.
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
SIEMonster - A very powerful and well documented open source SIEM with options to purchase support packages.
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.
AlienVault OSSIM - Alienvault integrates and correlates many popular network and security monitoring tools in one...
RapidSpike - RapidSpike is a reliability, performance and security monitoring service for transactional websites. Using next-generation synthetic monitoring & deeper than ever before data, RapidSpike is for businesses serious about protecting their online revenue