Quassel is a program to connect to an IRC network.
Quassel IRC is a modern, cross-platform, distributed IRC client based on the Qt4 framework. Distributed means that one (or multiple) client(s) can attach to and detach from a central core that stays permanently online -- much like the popular combination of screen and a text-based IRC client such as WeeChat, and similar to (but much more featureful than) so-called BNCs. Re-attaching your client will show your IRC session in the same state as you left it in (plus whatever happened while you were gone), and this even when you re-attach from a different location. In addition, Quassel IRC can be used like a traditional client, with providing both client and core functionality in one binary. An optional Beginner's Mode completely hides this feature, so Quassel IRC can be setup very easily.