HydraIRC

HydraIRC is an open-source IRC client with an attractive and easy to use interface. It supports DCC Chat and File transfers, Connecting to multiple servers, Dockable Floating Tabbed Windows, Autohiding Windows, DLL Plugins, Channel Monitoring, Message Logs, Event Viewer, Themes, Color schemes, Buddy groups, Audible and Visual Notifications , Reg-Exp Highlighting, Favorites and much more.