Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Boomi - The #1 Integration Cloud - Build Integrations anytime, anywhere with no coding required using Dell Boomi's industry leading iPaaS platform.
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
Postman - The Collaboration Platform for API Development
tSIP - tomeko.net/software: SIP client for Windows.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.