Empathy is an instant messaging (IM) and voice over IP (VoIP) client which supports text, voice, video, file transfers, and inter-application communication over various IM protocols. Developed by The GNOME Project
License: Open Source
Xabber is a mobile-focused, open-source chat application that supports multiple protocols, making it ideal for casual chatting and group discussions. In contrast, Empathy is a desktop-centric application with robust voice and video call capabilities, better suited for users on Linux who require integration with their desktop environment.