Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community

HelpSpace - The team inbox with super powers

Inbox by Vanilla - Free customer support software

Callbell - Callbell is a software as a service platform for customer communication via Direct Messaging Apps

ClearFeed - ClearFeed is a conversational Support platform for Slack and MS Teams