Zendesk Sunshine - Open, flexible CRM platform built on AWS
Voiptime Cloud Call Center - Cloud call center & telemarketing solution
Crmble - Easy peasy crm for Trello
CallKite - Your website’s video call center in just one click.
InStream CRM - Business relationship management platform - CRM alternative
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.