Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
LeadMaster - The LeadMaster LeadMasterCRM All-in-One solution includes: marketing automation, lead management, email marketing, website integration & much more.
Melrose Labs CloudPBX - Advanced Hosted Cloud PBX for Your Team.
Servetel - Communication management solution
Dialpad - Switch is a cloud-based phone system built for Google Apps users.