Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Drift - A messaging app that helps you grow your business.
Crisp Chat - Multi-channel customer support software
Drift for Enterprise - Automatically turn website traffic into sales meetings
Chatlio - When you have a business to run, your average instant messaging software just will not do. You need an internal presence upon which your entire team can collaborate on. Read more about Chatlio.
SendBird - SendBird is messaging-as-a-service.