For those that use virtually any type of online chat service, Adium is there to serve all of your online chatting needs. There are plenty of Mac applications out there to allow you to chat with your friends, but Adium stand tall above the rest as the best chat client available for Mac OS X. Based on the multi-platform open-source library Libpurple, Adium is a user-friendly chat application designed exclusively for Mac users. Adium supports all of the most common chat protocols, including AIM, MSN, Yahoo Messenger, Google Talk, and Facebook Chat, as well as at least a half dozen others.

Where the program really shines, however, is not the long list of protocols it can use but the visual interface; Just about everything about the way it works and looks can be customized. The look of the contact list can be tweaked to one’s liking in just about every way possible, making it easy to find your online buddies. Message windows can be individual or tabbed in a single window and they way they display the messages also has several options to suit ones needs from a very professional appearance to something more along the lines of iPhone text messages. Even the icon on the dock can be set to various different colors or you can easily import your own.

Did I mention it supports Growl notifications? For those unfamiliar with it, Growl integrates with many programs on your system to show you little pop-up notifications of what is happening in the background without making you Cmd-Tab back and forth. Adium integrates with Growl perfectly and allows you to see when your buddies come online or go offline, when you get a message, when a file transfer is completed, or just about anything else within the program that you might want a notification about.

Just about the only feature that I truly wish Adium had that it does not have integrated is video chat. Many of the chat protocols it has integrated can support this, but the program itself does not (yet?) support it.

Sounds like a great application, right? Well, I’ve got more good news. It’s free.

If you chat online via one of the various popular chat programs out there or even multiples, then this is the application for you. It blows just about any other chat program out of the water and will make your Windows-using friends jealous that they can’t get it.