#XMPP (aka #Jabber) is an easy, widely used free federated chat system.

There are thousands of instances to sign up at, such as chinwag.im and
xmpp.jp

There are also *lots* of apps.

Maybe the most important thing is that an app supports OMEMO privacy:

omemo.top

Some recommended OMEMO-compatible apps:

Conversations (Android)
conversations.im

Gajim (Win/Linux)
gajim.org

Monal (iOS/Mac)
monal.im

#Alternatives

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