CiviCRM - A Constituent relationship management for the Civic Sector
Daily.co for Intercom - Free video calls & screen shares embedded in Intercom
Odoo CRM - Open Source CRM
Pluot Communications - Big-screen video conferencing for startups
Salesforce - CRM software solutions and enterprise cloud computing from salesforce.com, the leader in CRM and platform as a service.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.