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 IM is a highly customizable instant messaging client that supports a wide range of protocols but lacks advanced communication features like voice and video chat. On the other hand, Kadu offers native support for voice and video calls, a strong focus on privacy, and cross-platform compatibility, making it a better choice for users who prioritize these features.