Tigase Messenger

XMPP/Jabber client AGPL-3.0-only

Quicksy

Jabber/XMPP with Easy Entry and Easy Discovery GPL-3.0-only

Notify2Jabber

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

aTalk

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

Pix-Art Messenger

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

Conversations with IPv6

A Jabber/XMPP chat client with IPv6 support GPL-3.0-only