Nebula: A small and lean IRC client written for motif/lesstif. Small system requirements, speed, portability, security and a clean GUI are its strong points.
A resource-conscientious, flexible, modular, platform-independent, scalable and robust server based on ircd-ratbox.
nwIRC is a small console IRC client for Unix systems. It works without third-party libraries and has been tested on Free/Net/OpenBSD, Darwin, Solaris, HP-UX, OSF1/Tru64, IRIX, AIX, Linux and Cygwin. Key features are multiserver/IPv6/DCC/modules support