Free portable cross-platform graphical multi pinger, 100%-pure java
Pen is a load balancer for udp and tcp based protocols.
A java packet sniffer and forger that wraps pcap libs.
Simple TCP proxy [MOVED to github!]
Various TCP/IP servers, clients and network management tools
Lightweight fully extendable client/server application framework
Network link bonding/trunking/aggregation and multichannel VPN daemon
High interaction honeypot solution for Linux based systems
MitM pentesting opensource toolkit
Highly configurable SNMPv1/v2c/v3 application-level proxy
Jateway is a general purpose TCP/IP connection proxy
Tkined/Scotty is a graphical network monitoring package
network control and reporting
A free high-performance alternative to TCP sockets
TCP/UDP Network Test Utility
Analyze the network carateristics like Delay, Jitter, Packet loss etc.