Pidgin is a free and open-source chat client which supports AIM, Google Talk, ICQ, XMPP protocols. Developed by Pidgin
License: Open Source
Pidgin is a versatile and highly customizable messaging client that supports multiple protocols, making it ideal for users who need flexibility and a wide range of features. In contrast, Psi+ offers stronger encryption and a more modern interface, focusing primarily on XMPP, which may appeal to users prioritizing security and simplicity.