Zeek is a powerful network analysis framework
Open-source systems performance monitor
Application Performance Monitoring System
Zenoss - Intelligent IT Operations Management
Pinger alert, STATICTICAL TABLES, send EMAILs or SMS by SMS GATEWAY
Open Source SIEM
We! Analyze - designed to analyze ArcSight SmartConnectors logs.
Panel Indicator to interact and monitor hosts
Network Intrusion Detection and Full Packet Capture System
NDPMon - Neighbor Discovery Protocol Monitor