Light-weight system monitor for X
Open Source Monitoring System for performance and availability.
Disk Inspection and Monitoring
Firewall log analyzer
tcptrace analyzes packet tcp connections and provides analysis
Monitorix is a system monitoring tool
Pinger alert, STATICTICAL TABLES, send EMAILs or SMS by SMS GATEWAY
track log files, block intrusions, and much more
Scalable, distributed monitoring system for high-performance computing
netflow collecting and processing tools
Monitoring backup jobs tool for Symantec NetBackup
Simple Multi Protocol Packet Sniffer - SMPPS
NDPMon - Neighbor Discovery Protocol Monitor