Tigase Messenger

XMPP/Jabber clientAGPL-3.0-only

Quicksy

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

Notify2Jabber

Send almost all text notifications to a Jabber account or your Gotify serverUnlicense

Xabber

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

aTalk

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

Pix-Art Messenger

is an Open Source XMPP/Jabber Messenger for AndroidGPL-3.0-only

Conv6ations

A Jabber/XMPP chat client which is fair to IPv6GPL-3.0-only