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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YateClient
Linphone
MicroSIP
We-Talk
Phoner
3CX Phone System
YakYak
FreeSWITCH
PhonerLite
Tragofone
Lingo
tSIP
YakYak
Jami
SessionTalk SIP Softphone
Phoner
YateClientLinphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
Lingo - Empower Creation and Ensure Brand Consistency. Build and Share libraries of visual assets with your entire team — all from your desktop.
We-Talk - Free online chat rooms where people chat and meet each other and chat with the stranger and learn new cultures and make friends.
tSIP - tomeko.net/software: SIP client for Windows.