Trillian is a multi-network chat client that supports Facebook, Google, AIM, ICQ, Twitter, and more.

It supports all of the features you've come to expect from your instant messaging client. These features include docking, multi-line edit boxes, buddy alerts, multiple connections, skinning, importing your existing contacts, skinnable emoticons, logging, global away or invisible features, and a unified contact list.

Trillian is a versatile chat application that can simultaneously utilize multiple accounts, making it a comfortable choice for all your IM needs, combined with its sleek interface.

Version History for Trillian:
https://www.trillian.im/changelog/windows/6.5/