Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Callbell - Callbell is a software as a service platform for customer communication via Direct Messaging Apps
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
HelpSpace - The team inbox with super powers
ClearFeed - ClearFeed is a conversational Support platform for Slack and MS Teams
Kanmail - An email client that works like a kanban board.