Zabbix

Zabbix is an enterprise-class open-source monitoring platform for monitoring networks, servers, virtual machines, cloud services, and applications. The platform provides agent-based and agentless monitoring, with support for SNMP, IPMI, JMX, and custom checks. Zabbix offers comprehensive features including auto-discovery, distributed monitoring, real-time alerting, data visualization, and reporting. The platform's template system enables rapid deployment of monitoring for common technologies, with hundreds of templates available from the community. Unlike commercial monitoring solutions, Zabbix has no per-host or per-metric pricing — the platform is fully free and open source, with commercial support available through Zabbix LLC. This makes it particularly popular in large environments where monitoring costs would otherwise be prohibitive.