RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Twilio - Brings voice and messaging to your web and mobile applications.
GoTo Connect - Jive PBX is a communication solution that offers remote communication services to companies such as video conferencing, text, and chat services.
8x8 - 8x8's VoIP business phone systems deliver affordable, cloud-based voice, video, messaging, and call center solutions, helping you serve customers anytime, anywhere.
CallHippo - Easy to use Phone System with World-Class Support
Slack - A messaging app for teams who see through the Earth!