Birdeye - #1 most trusted reputation and customer experience platform for local business
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Grade.us - Review marketing and monitoring platform, white-labeled for agencies and SEOs
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
Podium - Podium helps your business get more customer reviews, manage customer feedback, customer interaction, and online review management from one software.
tSIP - tomeko.net/software: SIP client for Windows.