Kadu is described as 'Open source Jabber/XMPP and Gadu-Gadu instant messenger client for Linux, *BSD, Mac and Windows' and is a instant messenger in the social & communications category. There are more than 10 alternatives to Kadu for a variety of platforms, including Mac, Windows, Linux, BSD and Flathub apps. The best Kadu alternative is Thunderbird, which is both free and Open Source. Other great apps like Kadu are Pidgin, Adium, Messenger and Psi XMPP Client.
BeagleIM is a lightweight and powerful XMPP client developed by Tigase, Inc. It provides an easy way to start using the XMPP Protocol (formerly known as Jabber) if you've never used it before. Veterans of the protocol will find many features here they are familiar.
Swift is an elegant, secure, adaptable and intuitive XMPP client, with features that make it suitable for a wide range of use scenarios.
A simple-to-use messaging app for 1:1 communication and small groups supporting SMS, MMS, matrix and XMPP through libpurple.
Sim-IM, Simple Instant Messenger, is a multiple protocol instant messenger for MS Windows, GNU/Linux, FreeBSD. Sim-IM supports Jabber/XMPP, Google Talk, ICQ and AIM (Oscar), Yahoo! Messenger and Microsoft Messenger (MSN)
Turnkey audio & video call services, with just 1 click. No downloads, data protected in Europe. Solutions for web use, mobiles and connected objects.
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