ICQ (OS X) for Mac

ICQ ('I seek you') is a user-friendly Internet program that searches for your friends and associates on the Net, alerting you in real time when they sign on. With ICQ, you can exchange messages and files, engage in real-time chat, play games, and more. ICQ now stores your contact list on the server, a new ICQ global hot key can be set in the preferences, better AppleScript support and much more.