Adium X
Looking to consolidate my various IM clients, I historically have used GAIM, this weekend I was looking for GAIM for my Mac, and stumbled across Adium in my googling.
They describe it best at the official Adium X site.
The Adium Team is proud to present to you Adium X 0.77, a multiple protocol instant messaging client. This is a culmination of a year long rewrite of adium, which now utilizes libgaim (the core part of gaim) to connect to multiple protocols, and is also based on a new plugin architecture. Partial address book integration, cool looking tabs, multiple protocols for instant messaging, and a compact contact list are some of the many features of the new Adium X. Give it a try; we’re sure you will like it.
Feel free to flame away if you have issues with this app, but thus far it has passed both my initial scruitiny and coolness tests…