Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
WATI - No-code chatbot builder for WhatsApp Business
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
SleekFlow.io - Sell, convert & support better on chat
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Front - multi-channel inbox service for collaborative teams