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 an open-source, multi-protocol messaging client ideal for users who prefer flexibility and customization, whereas WhatsApp Messenger is a widely-used platform focusing on security and media sharing, appealing to a broader audience.