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.
Grafana - Data visualization & Monitoring with support for Graphite, InfluxDB, Prometheus, Elasticsearch and many more databases
GoAccess - Open source real-time web log analyzer and interactive viewer that runs in a terminal in *nix...
Prometheus - An open-source systems monitoring and alerting toolkit.
Logz.io - Logz.io provides log analysis software with alerts, role-based access, unlimited scalability and free ELK apps. Index, search & visualize your log data!