free, distributed and user-friendly IRC client with Twitter, and XMPP/Jabber support for Linux, Windows and macOS based on GNOME / GTK+

Screenshot of Smuxi on GNOME3 Screenshot of Smuxi on Ubuntu Unity Screenshot of Smuxi on Mac OS X

Screenshot of Smuxi on Windows 8 Screenshot of Smuxi on Windows 7 Screenshot of Smuxi's text frontend