qutIM is free and open-source multiprotocol (ICQ, Jabber, Mail.Ru, IRC, VKontakte) instant messenger. Developed by Rustam Chakin & Ruslan Nigmatullin
License: Open Source
qutIM is an open-source, lightweight messaging client focused on customization and multi-protocol support, making it ideal for tech-savvy users. In contrast, Tencent QQ is a feature-rich platform with a vast user base and integrated services, but it may raise privacy concerns and can be resource-intensive.