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!
SendPulse - Maximizing e-mail marketing open rates automatically
GetChat.App - Add WhatsApp chat to your website for free
Botsify - Ever wonder if you could replace your live chat support system with a chatbot?. Its possible now with Botsify Chatbot For Website.
Avochato - Text messaging for your business.