Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Smooch.io for Facebook Messenger - Message your customers from Slack, Front, a bot or anywhere!
Drift - A messaging app that helps you grow your business.
Pullstring - Powering computer conversation across all platforms.
Userlike - Userlike is free live chat software for website and mobile support.
Conversity - Easiest way to manage Facebook Messenger chats