Adium is an Open source multi-protocol instant messaging client for Mac OS X, supports MSN, Jabber, Yahoo! and other networks. Developed by Adium Team
License: Open Source
Tox is primarily focused on providing secure, encrypted messaging and calls with a peer-to-peer architecture. In contrast, Adium boasts multi-protocol support, allowing users to connect to various messaging services, but with less emphasis on security and encryption.