qutIM is free and open-source multiprotocol (ICQ, Jabber, Mail.Ru, IRC, VKontakte) instant messenger. Developed by Rustam Chakin & Ruslan Nigmatullin
License: Open Source
Instantbird offers a more customizable interface and supports a wide range of protocols, making it an attractive choice for users who prioritize personalization. In contrast, qutIM provides a straightforward user experience but lacks some advanced features like encryption and mobile support.