A section of the roster
Monitoring & observability
Watch hosts, network gear, VMs and services in one place — pull the metrics, draw the dashboards, page someone when it breaks.
Zabbix Open-source monitoring across servers, network gear, VMs and applications. open sourcedesktop Linux/Unix server, web UI; agents for Windows/Linux/macOS/Unix PRTG Network Monitor Sensor-based monitoring from Paessler for networks and infrastructure. freemiumcloud + desktop Windows server + web/mobile; also SaaS (Hosted Monitor) Nagios (Core / XI) Veteran host and service monitor: free Core, commercial XI. freemiumdesktop Linux/Unix server, web UI Grafana Dashboards and visualisation layered over Prometheus, Zabbix, databases and clouds. open sourcecloud + desktop Linux/Windows/macOS/Docker, web; cloud Prometheus Time-series monitoring and alerting, the default in cloud-native stacks. open sourcedesktop Linux/Windows/macOS, web UI; CNCF Datadog Cloud observability for metrics, traces and logs, with nothing to host yourself. paid / trialcloud SaaS (web + mobile); agent for Windows/Linux/macOS