A free high-performance alternative to TCP sockets
Low latency, high bandwidth IP for virtual machines
IOSec Addons are enhancements for web security and crawler detection
Port forwarding between TCP and UDP
Networking framework for Java applications
An impressive early implementation of TCP/IP
A simple packet sniffer for local networks
Recursive mapping/discovery of network devices via CDP/OSPF
Multithreaded Proxy Enumeration Utility
A simple loadbalancer written in java
NetStress is a DDoS and network stress testing tool.