RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Twilio Video - Real-time video infrastructure and SDK
Amazon Chime - Online meetings and video conferencing
Truly Wireless - Wireless business phone system built for sales and support team.
Algo - Videos that speak with APIs.
Asterisk - An open source telephony switching and private branch exchange service for Linux.