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
Instantbird is a lightweight, multi-protocol chat application focused on simplicity, while Zulip offers a robust threaded conversation model ideal for team collaboration. The choice between them depends on whether you prioritize speed and ease of use or advanced organizational features.