Quassel (sometimes referred to as Quassel IRC) is a cross-platform IRC client introduced in 2008. It is dual-licensed under GPLv2 and GPLv3, while most graphical data is licensed under the LGPL and provided by the Oxygen Team. The client part of Quassel uses the Qt framework for its user interface.
Quassel is split up into two parts by a server-client model; a client and a core. There is also a monolithic version of the official client that does not require a core. The core(server) is the application that actually does the communication with IRC networks, while the client(s) only communicates with the core. This gives the user a flexibility of having the same instance to IRC networks on different clients (e.g. mobile, desktop at the same time).
Just install thepackage if you only want to use Quassel from a single computer.
Setting up multiple clients to connect through the same core
Generate a certificate (this will be valid for 1 years, after which it needs to be reissued, just change the -days to another value if you so desire):
# openssl req -x509 -nodes -days 365 -newkey rsa:4096 -keyout /var/lib/quassel/quasselCert.pem -out /var/lib/quassel/quasselCert.pem
As this is a self-signed certificate, you can type whatever you want in the fields.
Open port 4242 in your firewall.
# systemctl start quassel
Start the client and connect to core:
Accept your self-created certificate.
Now set up your IRC-servers and IRC-nicknames on the core.
Once it all works, you can set it up to start automatically through on system boot:
# systemctl enable quassel
If you were previously using quassel-monolithic, your settings might be messed up. Close quasselcore. Move your settings database to a backup copy:
$ mv ~/.config/quassel-irc.org/quassel-storage.sqlite ~/.config/quassel-irc.org/quassel-storage.sqlite.bak
Then start quasselcore again and connect from your client, you should now get the wizard to show, however, all settings will have to be re-entered.