The best open source Uptime Monitor alternative to Paessler PRTG Network Monitor is Zabbix. If that doesn't suit you, our users have ranked more than 100 alternatives to Paessler PRTG Network Monitor and four of them are open source Uptime Monitor Services so hopefully you can find a suitable replacement. Other interesting open source Uptime Monitor Service alternatives to Paessler PRTG Network Monitor are Pandora FMS, Leaf Node Monitoring and Simple Observability.
Gather and analyze accurate statistics and performance metrics, visualize it, get notified about current and potential issues without delay, and take advantage of our time-tested professional development and support.
Enterprise-ready monitoring solution that provides unparalleled flexibility for IT to address both immediate and unforeseen operational issues, including infrastructure and IT processes.
Open Source (GPLv3) Network Monitoring for Windows, Linux & Android. Simple setup, auto-detects running services, runs checks concurrently, open port scanning and alerting. Written in C++ & Qt 5.
Server monitoring with metrics, logs, alerts, and mobile access. One-command install, simple UI only setup and a clear pricing.
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Both offer network monitoring and alerting