nxlog - NXLog offers log management solutions for companies of all sizes.
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.
Nagios Log Server - Nagios Log Server is centralized log management, monitoring & analysis software. Quickly & easily manage, monitor and analyze log data. Download Today!
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
LogicMonitor - LogicMonitor is the SaaS performance monitoring platform for the world's best IT teams. Deploy Fast, Monitor More, Improve Ops.