DinoX
Open-source XMPP messenger for Linux and Windows
...Features include encrypted chats with OMEMO and OpenPGP, group chats, file sharing, voice and video calls, and recorded voice and video messages. Optional features include Tor routing, RSS/Atom feeds, MQTT and a local automation API. Feature availability depends on the server, settings and other participants' clients.
DinoX is an independently developed fork of Dino, licensed under GPL-3.0-or-later.
Official downloads: https://git.dinox.im/dinoxim/dinox/releases
Source code: https://git.dinox.im/dinoxim/dinox
User guide: https://dinox.im/guide/index.en.html