Camunda - The Universal Process Orchestrator
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
jBPM - jBPM is a flexible Business Process Management (BPM) Suite.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
ProcessMaker - ProcessMaker is an easy to use BPM and workflow software solution. It is used to design, automate, and deploy business processes of any kind.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs