Intercom
Intercom is a sales, marketing, and support solution platform that builds better customer relationships through personalized, messenger-based conversational experiences.
It uses a single tool that lets you sell and support customers through every step of the customer journey. Features include Business Messenger, Customizable bots, Automated answers, Product tours, Targeted Messages, and many more. Intercom works as a mobile application too, which allows you to respond to queries using your iOs or Android devices.