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All‑in‑one monitoring solution with up to 100 sensors free, offering bandwidth, uptime, and device health dashboards.
#3 Zabbix
Open‑source enterprise‑grade monitoring platform with auto‑discovery, customizable dashboards, and extensive alerting.
#4 Nagios Core
Free, open‑source monitoring engine that tracks hosts/services and integrates with a large plugin ecosystem.
Free, ad‑supported tool that monitors device uptime, bandwidth, and provides simple alerting for small networks.
#6 LibreNMS
Community‑driven, auto‑discovering network monitoring system with customizable alerts and mobile‑friendly UI.
Free network monitoring and management utility that maps devices, tracks performance, and sends notifications.
Open‑source network monitoring platform focused on simplicity, with auto‑discovery and beautiful graphs.
#9 NetXMS
Free, open‑source network monitoring and management system with multi‑tenant support and extensive API.
Compact suite of network utilities (IP scanner, bandwidth monitor, packet sniffer) with a 30‑day free trial.
Free for up to 10 devices, offering real‑time health monitoring, SNMP polling, and basic alerting.
#12 UptimeRobot
Free cloud‑based service that pings up to 50 URLs/IPs every 5 minutes and sends instant downtime alerts.
Basic website and server uptime monitoring with email alerts; ideal for small office web services.
#14 Fing Desktop
Free network scanner and monitoring tool that discovers devices, tracks IP changes, and alerts on new connections.
#15 Cacti
Open‑source graphing solution that uses RRDtool to visualize bandwidth, CPU, and other SNMP metrics.
Free version supports up to 25 devices, offering auto‑discovery, customizable dashboards, and email alerts.
Cloud‑hosted version of PRTG with 100 sensors free, no on‑premise installation required.
Free plan monitors up to 5 URLs/IPs, provides uptime, response time, and basic performance dashboards.
30‑day trial of the full-featured network monitoring suite, covering device discovery, alerts, and reporting.
Cloud‑based network monitoring with auto‑discovery, topology maps, and proactive alerts; free for up to 5 devices.
Simple Windows utility that pings hosts, checks ports, and sends email/SMS alerts on failures.
Commercial version of Nagios with a 30‑day trial, offering advanced reporting, dashboards, and support.
Full‑featured NPM with auto‑discovery, NetPath, and customizable alerts; 30‑day trial for small offices.
Companion mobile app for PRTG that lets you view sensor status, receive push alerts, and run reports on the go.
Hosted Zabbix service with limited sensors, ideal for small offices that prefer SaaS over self‑hosting.
Real‑time performance monitoring with beautiful web UI, auto‑detects services, and offers free on‑premise deployment.
Metrics collection engine (Prometheus) paired with Grafana dashboards; free, highly customizable for small networks.
Free, open‑source monitoring suite with auto‑discovery, powerful alerts, and integrated dashboards.
Network traffic probe that provides real‑time visibility into bandwidth usage, protocols, and hosts.
#30 Wireshark (Free)
Industry‑standard packet analyzer; while not a full monitor, it helps troubleshoot network issues in small offices.
Affordable sensor packs (e.g., 50‑sensor pack) that extend the free edition for a modest yearly fee.
30‑day trial for IP address management with integrated ping monitoring and DHCP/DNS health checks.
Free tier includes basic network device monitoring and ticketing for up to 5 technicians.
#34 OpenNMS Horizon
Open‑source network management platform offering event processing, performance measurement, and fault management.