Gajim is an instant messaging client for the XMPP protocol which uses the GTK+ toolkit. Developed by Gajim Team
License: Open Source
Gajim is a lightweight, open-source XMPP client that excels in supporting multiple accounts and plugins, making it highly customizable for users. On the other hand, Kopete offers broader protocol support and integrates well with the KDE desktop but may not be as feature-rich outside that environment.