Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
Octopussy.pm - Octopussy, Log Management Solution
Kafka - Apache Kafka is publish-subscribe messaging rethought as a distributed commit log.
Quest InTrust - Event log management software. Monitor real-time logs from numerous data sources in a single pane with our log monitoring tool, InTrust.
Snare - Snare is well known historically as a leader in the event log space.
McAfee Enterprise Log Manager - McAfee Enterprise Log Manager automates log management and analysis for all log types and integrates with McAfee Enterprise Security Manager for analysis and incident management.