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NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Server Monitoring - A server monitor is a tool that monitors your server and website on close intervals and reports to you if it's inaccessible.
nfsen-ng - nfsen-ng aims to be an in-place replacement for the ageing nfsen.
Nodeping - NodePing Server Monitoring and Web Site Monitoring. Simple but powerful Internet service monitoring.
FastNetMon - FastNetMon is a very fast DDoS analyzer with sflow/netflow/mirror support.