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Any xmpp client that supports OTR. I like psi+ (https://psi-plus.com/), but there are many.

You can pair it with conversations on android (https://f-droid.org/packages/eu.siacs.conversations/).

OMEMO[1] seems to be the new hotness for end to end XMPP encryption. The feature is that it is better integrated than OTR and tends to be easier to use.

[1] https://omemo.top/

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