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
Psi is a feature-rich instant messaging client that supports multiple protocols and offers extensive customization, making it suitable for advanced users. In contrast, Instantbird is a more lightweight and user-friendly option, focusing on simplicity and speed, making it ideal for casual users.