AthenaIRC

AthenaIRC is a free, Aqua savvy IRC client designed for all those people who want a simple and efficient client. Its small footprint doesn`t take up a lot of desktop space, while still offering a lot of conveniences. Some features of note include: Channel History, Channel Favorites, Command Aliases, Channel Taskbar, Nickname completion, User defined contextual menu pop-ups, optional single window interface, Buddy list style notify system.