Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
Prometheus - An open-source systems monitoring and alerting toolkit.
Kafka - Apache Kafka is publish-subscribe messaging rethought as a distributed commit log.
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.
Snare - Snare is well known historically as a leader in the event log space.
MindArray IPM - Unified Network Monitoring Tool, Application Monitoring, Log Management, Asset Management, Service desk, Help desk & IT Service Management. Get free trial.