The developers of Adium, a free instant messaging application for Mac OS X, have confirmed the software has attracted 645,000 downloads so far.

The fruit of over a year and a half of development, Adium 1.0 shipped just weeks ago on 2 February. It's compatible with more instant messaging systems than the Apple-supplied iChat.

The software — which boasts a Mac OS X user interface — is compatible with most major instant messaging systems, including AIM, MSN, Jabber, Yahoo, iChat (and Bonjour), Live Journal, Lotus Sametime, Novell Groupwise, Google Talk and more.

The software offers an installation set-up assistant, improved account management, privacy management, iTunes Now Playing status, optional Dock-like hiding of the contact list, grouping of saved status messages, and a redesigned chat transcript viewer with improved searching.

Adium 1.0 also offers service-specific features such as AIM file transfer and Direct Connect image transfer improvements, Yahoo invisible status, receiving of MSN custom emoticons, and Google Talk buddy icons and typing indication support.

Adium X 1.0 requires OS X 10.3.9 or greater and is available in 20 languages.