VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.
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Cyph
Element.io
ChatSecure
Keybase Chat
Hermes
Bit Chat
Otr.to
Kandan
Zhoo
Seald
Keybase Chat
Spike
Crypho
StealthChat
Brie.fi/ng
ZeroID
CyphElement.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Seald - Keep your conversations secure, everywhere.
ChatSecure - ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
Keybase Chat - End-to-end encrypted chat built into Keybase
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Hermes - Pandora Client for OS X