Psi is a free instant messaging application designed for the XMPP network (including Google Talk). Fast and lightweight, Psi is fully open-source and compatible with Windows, Linux, and Mac OS X.
License: Open Source
Empathy focuses on emotional tracking and user experience with a user-friendly interface, while Psi emphasizes advanced analytics and collaboration tools, making it suitable for teams. Empathy is ideal for individual users seeking emotional awareness, whereas Psi is designed for organizations needing data-driven insights.