The pidgin instant messaging client (formerly known as gaim) is a multi-protocol client, that supports not only AIM, but also Yahoo Messenger, MSN Messenger, Jabber, Gmail Chat (Google Talk), Zephyr and IRC.
It is available under the Applications menu, in the Internet category, or from the command line as pidgin.
To configure your AIM account:
- Choose Accounts > Manage Accounts from the Pidgin Buddy List window.
- Click the Add.. button.
- In the "Add Account" window, select AIM as the protocol, and enter your AIM username (screen name) and password. You can leave all the other settings at their defaults.