Software that can be used as an alternative to Trillian for Mac:
  • 5 / 5
    5 votes
    Adium is a multiple protocol instant messaging client.
    • Freeware
    • Mac OS X
  • 17 votes
    Pidgin is a multi-protocol instant messaging client for Linux, BSD, MacOS X, and Windows.
    • Freeware
    • Windows/Mac/Linux
  • 4 / 5
    2 votes
    Download Messages Beta and get a taste of what’s coming in OS X Mountain Lion.
    • Freeware
    • Windows (all)