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
Adium is known for its extensive customization and support for various protocols, making it suitable for users who want a tailored experience. In contrast, Instantbird is lightweight and user-friendly, focusing on speed and simplicity, which appeals to users looking for a quick and efficient messaging solution.