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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Xabber
Conversations.im
Signal
WhatsApp
Telegram
Pidgin
ChatSecure
Element.io
PhonerLite
Tragofone
Lingo
tSIP
YakYak
Jami
SessionTalk SIP Softphone
Phoner
Xabber PhonerLiteConversations.im - XMPP client designed with ease of use and security in mind
Tragofone - 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.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
tSIP - tomeko.net/software: SIP client for Windows.