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
CSipSimple
XO Hosted PBX
Zoiper
Sipdroid
Linphone
Google Voice
Sipnetic
HoduPBX
PhonerLiteTragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
XO Hosted PBX - Hosted PBX is a scalable UC solution that uses cloud technology to integrate HD voice & data services, mobility, along with advanced calling
Lingo - Empower Creation and Ensure Brand Consistency. Build and Share libraries of visual assets with your entire team — all from your desktop.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
tSIP - tomeko.net/software: SIP client for Windows.
Sipdroid - Free and open-source SIP/VoIP Client