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

HelpScout - Help Scout is a simple, straightforward way to provide excellent support

Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors

Drift - A messaging app that helps you grow your business.

Crisp Livechat - The most modern experience to talk to website visitors

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