Internet Relay Chat is a simple way to chat with several people at the same time, using either a special
program/application, or a web browser. If your chat program supports IRC you can talk to other 0 A.D. players and developers by connecting to: !#0ad on irc.quakenet.org, if not just click this link to chat in your browser:
http://webchat.quakenet.org/?channels=0ad
From the Wildfire Wiki