Amazon Chime - Online meetings and video conferencing
AuthKey.io - SMS API and WhatsApp Business API
Algo - Videos that speak with APIs.
100ms Live - Video and Live Streaming infra for a video-first world
Ziggeo - Cloud-Based Video Recorder / Player. Award-Winning API + Server Side SDKs
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...