Kadu is a free and open source multi-platform instant messaging client that supports Gadu-Gadu, XMPP IM networks and other services based on XMPP like Google Talk. Developed by KaduTeam
License: Open Source
Miranda NG is a highly customizable and versatile messaging application that supports a wide range of protocols and offers extensive plugin options, making it suitable for power users. In contrast, Kadu is a simpler, lightweight client that is easy to use for basic messaging needs but lacks the advanced features and customization options that Miranda NG provides.