WinDivert: Windows Packet Divert
Open Source Monitoring System for performance and availability.
Nagios network monitoring software is enterprise server monitoring
Manage and interpret IPMI systems with common a software tool
Xymon monitors your hosts, your network services, and everything else.
Intelligently block brute-force attacks by aggregating system logs
Firewall log analyzer
High capacity syslog data collection, filtering, and management.
ICMP-based network bandwidth measurement tool
A Swiss army knife for your daily Linux network plumbing
repair corrupted pcap and pcapng files
tcptrace analyzes packet tcp connections and provides analysis
A simple, portable port scanner
One of the most advanced DNS Proxy and DNS Firewall in one product.