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3CX is a business communications platform for handling calls through web, desktop and mobile apps.
Wazo Platform is an open source stack of telecom microservices for developers building programmable voice, video, messaging and presence services.
PortSIP PBX is a multi-tenant communications platform from PortSIP Solutions, Inc.
Yeastar P-Series Cloud Edition is a cloud phone system combining business telephony, contact-center functions, and integrations.
Thirdlane Business Communications Platform provides business voice, contact-center, messaging, customer applications, administration, and…
PBXware is a paid business phone system with web, desktop, and mobile apps across Windows, macOS, iOS, Android, and Linux.

