Intercom for WordPress by lumpysimon is a customer relationship management (CRM) and messaging tool for web app owners. WordPress is being widely used as a web app nowadays, so Intercom is an ideal companion app to find out more about your users, contact them, get their instant feedback, and track your relationship with them over time so you can spot those who need attention. Intercom is free to use during the public beta
It allows you to securely connect to Intercom using secure key authentication mode, and you can optionally send extra custom data about your users.
Intercom website: www.intercom.io