Cerulean Studios

Trillian
FreeTrillian: A Versatile Chat Application
Android
Trillian
FreeChat with friends on MSN, Facebook, Yahoo, MySpace, AIM or ICQ, Google, Skype, IRC, and Jabber.
Windows
Trillian
FreeChat with friends on MSN, Facebook, Twitter, Yahoo, MySpace, AIM/ICQ, Google, Jabber, studiVZ.
MacTrillian for Web
FreeComprehensive Chat Solution with Trillian for Web
Web Apps
Trillian
FreeTrillian: A Versatile Messaging App for iPhone
iOS