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.
Site24x7 is Zoho's all-in-one website and application monitoring platform, offering website, server, application, cloud, and real-user monitoring with AI alerting and multi-location global monitoring nodes to help teams ensure availability and performance.
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.
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.
Moss is a cloud server management platform from German developers (moss.sh), known for its minimal workflow, letting PHP developers deploy applications with one click and manage multiple cloud servers with built-in monitoring and alerts.
Ajenti is an open-source Linux server management panel created in 2012 by Russian developer Eugene Pankov, MIT-licensed and free with 8k+ GitHub stars, lightweight and plugin-rich for visual administration on low-end VPS.