Dialpad - Switch is a cloud-based phone system built for Google Apps users.
CloudTalk - Work locally, grow globally
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Webinato - Webinato is a platform for webinar automation.
3CX - Hosted PBX with CRM integration and mobile apps
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.