GNU/Linux
Dino
Dino is a new modern looking Jabber/XMPP app for GNU/Linux. It supports audio & video and small conference calls. Get it from your distribution's package manager or here:
The Flatpak version of Dino also runs well on mobile Linux distributions like PostmarketOS or Mobian.
Gajim
Gajim is a fully featured Jabber/XMPP desktop app that runs on GNU/Linux. It focusses on a power-user feature set. Get it from your distribution's package manager or here: