Light-weight system monitor for X
Open Source Monitoring System for performance and availability.
Firewall log analyzer
tcptrace analyzes packet tcp connections and provides analysis
Pinger alert, STATICTICAL TABLES, send EMAILs or SMS by SMS GATEWAY
Scalable, distributed monitoring system for high-performance computing
netflow collecting and processing tools
Simple Multi Protocol Packet Sniffer - SMPPS
NDPMon - Neighbor Discovery Protocol Monitor