Instantbird is a cross-platform instant messaging client based on Mozillas XULRunner and the open source library libpurple used in Pidgin. Developed by Florian Quèze and Quentin Castier
License: Open Source
Gajim is a more feature-rich and customizable application that appeals to advanced users and developers, while Instantbird focuses on simplicity and ease of use, making it more suitable for casual users. Gajim's robust support for plugins and protocols makes it a powerful choice for those needing extensive functionality.