Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Voiptime Cloud Call Center - Cloud call center & telemarketing solution
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
CallKite - Your website’s video call center in just one click.
CallHub - Predictive Call Center, Voice and Text Broadcasting app
MangoCRM - MangoCRM is a Contact management for the rest of us. Add Unlimited users for $9/mo. No annual contracts. No hidden fees. No complications. Manage your business billing, contacts, leads, and more with Mango.