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.

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.

Olark - Real-time chat and monitoring of your website visitors through Google Talk and Jabber.

Re:plain - The simplest live chat in the world

SuchChat - Telegram-first customer support tool