Xabber

Jabber (XMPP) client with multi-account support, clean interfaceGPL-3.0-only

Quicksy

Jabber/XMPP with Easy Entry and Easy DiscoveryGPL-3.0-only

Cheogram

Chat on the Jabber network (XMPP protocol); focus on features for gateway usersGPL-3.0-only

aTalk

XMPP/Jabber client with encrypted instant messaging and video callsApache-2.0