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.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors
ChatPirate - Offer help and capture leads with a truly simple live chat.
GoSquared Live Chat - Beautiful, simple, and free live chat for your website