a multi-purpose application level gateway, or a proxy server which runs on multiple platforms (Unix, Windows, MacOS X and OS/2). DeleGate mediates communication of various protocols (HTTP, FTP, NNTP, SMTP, POP, Telnet, SOCKS, etc.)
a software framework that allows for advanced sequence and protocol stream analysis by utilizing bioinformatics algorithms. The sole purpose of this software is to identify protocol fields in unknown or poorly documented network protocol formats.
a discrete event simulator targeted at networking research. Ns provides substantial support for simulation of TCP, routing, and multicast protocols over wired and wireless (local and satellite) networks
aims to be a secure IM for multiple platforms. Keep in touch is an attempt to create a secure instant messenger - it supports its own XML based protocol aswell as ICQ and AIM
a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of cluster