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Initially released July 1, 2000, as a freeware IRC client, the first commercial version (Trillian Pro 1.0) was published on September 10, 2002. The program was named after Trillian, a fictional character in The Hitchhiker's Guide to the Galaxy by Douglas Adams. The old version of the official web site even used to have a shrine to Douglas Adams on its front page.


On August 14, 2009, the prior major release of Trillian for Windows, named Trillian Astra (4.0), was launched, along with its own Astra network. Trillian Astra has a free version, and a premium version with extra features.