Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Avochato - Text messaging for your business.
SendPulse - Maximizing e-mail marketing open rates automatically
Message Me - Website to create your contact business card
Botsify - Ever wonder if you could replace your live chat support system with a chatbot?. Its possible now with Botsify Chatbot For Website.
Slack with your Users - Speak to your app's users entirely within Slack