In 2026, the best network monitoring tools are Kentik, Datadog, SolarWinds NPM, LogicMonitor, Cisco ThousandEyes, Dynatrace, Auvik, Paessler PRTG, ManageEngine OpManager, Zabbix, OpenNMS, and WhatsUp Gold — spanning four overlapping categories: network intelligence platforms, full-stack observability, digital experience monitoring (DEM), and traditional network performance monitoring (NPM), including open-source tools.