Pidgin is a free and open-source chat client which supports AIM, Google Talk, ICQ, XMPP protocols. Developed by Pidgin
License: Open Source
Bit Chat focuses on secure messaging with an emphasis on end-to-end encryption, making it ideal for privacy-conscious users. Pidgin, on the other hand, offers extensive customization and support for various protocols, but lacks built-in encryption, which might be a drawback for those prioritizing security.