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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PhonerLite
Tragofone
Lingo
tSIP
YakYak
Jami
SessionTalk SIP Softphone
Phoner
StealthChat
Signal
Element.io
Telegram
Wickr
Snapchat
Vine Messages
Threema
StealthChat is an industrial strength chat and phone call app for professionals that value real privacy and security. StealthChat uses advanced end to end encryption to ensure that only the sender and recipient have access to the content of the message or phone call.
PhonerLiteTragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Lingo - Empower Creation and Ensure Brand Consistency. Build and Share libraries of visual assets with your entire team — all from your desktop.
Element.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.
tSIP - tomeko.net/software: SIP client for Windows.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.