Answers for companies

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/business/chat/chat-clients

XMPP (Jabber) clients are plentiful. The selection is so large that even the XMPP Standards Foundation maintains its own extensive list. This page provides only a small selection of clients chosen by mailbox for their security features:

Software	OTR	OpenPGP	OMEMO	SSL/TLS	Enforce DNSSEC
Gajim (Windows, Linux)	with plugin	yes	experimental	-	-
Jitsi (Java)	yes	-	-	-	yes
Conversations (Android)	yes	yes	yes	-	-
ChatSecure (iOS)	yes	-	yes	-	-
Psi/Psi+	-	yes	-	-	-
Mozilla Thunderbird	-	-	-	yes	-
TorMessenger	yes	-	-	yes	-