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
Silent Phone
Signal
Skype
StealthChat
Wire
Telegram
Cellcrypt
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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.
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
tSIP - tomeko.net/software: SIP client for Windows.
StealthChat - StealthChat is Encrypted, Private, Secure Calls and Chats on Android and Apple iOS