Chat, meetings, and collaboration app, part of the Microsoft 365 compliance program.

Team messaging and channel-based chat platform for workplace communication.

Video conferencing, calling, and collaboration platform from Cisco.

Cloud communications platform providing APIs for SMS, voice, video, and email messaging.

Video conferencing, webinar, and unified communications platform.

Email delivery platform providing transactional and marketing email services with analytics and automation.

Cloud communications platform for phone, messaging, video, and contact center.

Cloud communications APIs and unified communications platform, owned by Ericsson.

AI-powered business communications platform (calling, messaging, meetings, contact center).

Video conferencing and event platform owned by Verizon.

Video conferencing and online meeting software from GoTo (formerly LogMeIn).

Cloud communications platform (voice, video, chat, contact center) for businesses.

Async video messaging tool for screen recording and team communication, owned by Atlassian.

Developer-focused transactional email API platform.

End-to-end encrypted secure messaging and collaboration platform for enterprises and government.

Browser-based video meeting platform, based in Norway.

Virtual phone system for small businesses and entrepreneurs, owned by GoDaddy.

Voice, video, and text chat platform originally built for communities and gaming, increasingly used for business communities.