An advanced network simulator to design and configure virtual networks
A benchmark suite for reliable testing of IP networks.
Anti Spam SMTP Gateway
Synchronize directories
Xplico is a Network Forensic Analysis Tool (NFAT)
DSL for writing communication benchmarks
Open Source SIEM
Energy and environmental monitoring of the server room
Scalable, distributed monitoring system for high-performance computing
Network link bonding/trunking/aggregation and multichannel VPN daemon
Two-factor authentication system
...has moved to packetpeeper.org
Collects data about network useage using libpcap.
Hierarchical Cluster Engine project
NetStress is a DDoS and network stress testing tool.
ss7mon an SS7/SIGTRAN signalling monitor
Tool for identifying Network Service Dependencies