Daily.co for Intercom - Free video calls & screen shares embedded in Intercom
CiviCRM - A Constituent relationship management for the Civic Sector
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.
Odoo CRM - Open Source CRM
Got A Minute? - Messaging app that limits conversations to 1 minute
WORKetc CRM - All-in-one business management system. CRM + Social + Projects + Billing