RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Video SDK from Zoom - Build fully customizable video-based apps
JustCall - The Cloud Phone System of choice for modern sales and support teams. We help end clueless conversations by adding context to every call.
Amazon Chime - Online meetings and video conferencing
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
AuthKey.io - SMS API and WhatsApp Business API