nxlog - NXLog offers log management solutions for companies of all sizes.
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!
Graylog - Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
DataDog Log Management - DataDog Log Management is a trusted and nimble software that is surfacing the log analysis with complete visualizations and prediction.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
LogicMonitor - LogicMonitor is the SaaS performance monitoring platform for the world's best IT teams. Deploy Fast, Monitor More, Improve Ops.