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

Raspberry Pi users running Raspbian can install Smuxi from this release PPA, just run the following commands:

sudo -s bash -c 'echo "deb precise main" >> /etc/apt/sources.list'
gpg --keyserver --recv-keys FC6D77D5
gpg --export --armor FC6D77D5 | sudo apt-key add -
sudo apt-get update
sudo apt-get install smuxi-engine

Now you can start the smuxi-server from a shell, for more details see the server how to.