Amazon MQ - Amazon MQ is a managed message broker service for ActiveMQ that makes it easy to set up and operate message brokers in the cloud. Easily migrate messaging.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
ZeroMQ - ZeroMQ is a high-performance asynchronous messaging library.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Apache Qpid - Apache Qpid makes messaging tools that speak AMQP and support many languages and platforms.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs