free, distributed and user-friendly IRC / Twitter / XMPP / Campfire / JabbR client for Linux, Windows and Mac OS X based on GNOME / GTK+

Smuxi 1.0 with persistent chat history, persistent message markers/counters, single application instance support and NickServ support. Packages are available for Windows, Mac OS X and Debian (Sid). Here you can read the full release announcement. For users running a development build of Smuxi it is recommended to simply upgrade to the newest development build.