Founded in 2001 and headquartered in Riga, Latvia, Zabbix is an open-source enterprise monitoring platform deployed by 10000+ enterprises. A single server manages 10000+ devices with distributed Proxy architecture.
PRTG Network Monitor by Paessler AG is an all-in-one network monitoring platform with 500+ built-in sensor types. The freeware edition supports 100 sensors at no cost.
Paessler AG, founded in 1997 in Nuremberg, Germany, is the developer of PRTG Network Monitor. Its all-in-one sensor architecture, 500+ pre-built monitoring types, and free edition are popular with small and mid-size IT teams.
Founded in 2006 in Ireland, Observium is an auto-discovery network monitoring platform. It automatically identifies and monitors thousands of device types, offering a free Community edition and a paid Professional edition.
Munin is an open-source server resource monitoring tool from Norway with a Perl-based Master/Node architecture and RRDTool graphing engine. Its plug-and-play plugin mechanism keeps deployment simple for small server clusters.
LibreNMS is a PHP-based open-source auto-discovery network monitoring system that discovers network devices via SNMP, with 1,600+ device templates and a flexible alert rule engine.
Founded in 2009 and headquartered in Nuremberg, Germany, Icinga is an open-source enterprise monitoring system forked from Nagios. Icinga 2 rewrites the core engine in C++ with a modern web UI and native distributed architecture.
Founded in 2001, Cacti is an open-source RRDTool-based network traffic graphing tool that collects data via SNMP and generates visual charts, with template-based device management and 25 years of trend analysis.
SolarWinds, founded in 1999 and headquartered in Austin, Texas, is a leading provider of IT monitoring and observability software. Its Orion platform covers network, server, database, storage, and ITSM, serving 300,000+ customers worldwide.
Founded in 1999 and headquartered in Saint Paul, Minnesota, USA, Nagios is the pioneer of IT infrastructure monitoring. Nagios Core is free and open source, while Nagios XI offers web management and reporting.