Enterprise Messenger 1.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application was originally produced by Mosaic Networx LLC. The application lies within Communication Tools, more precisely Texting & Video calls. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Enterprise Messenger is an SMS service for business. This program enables SMS on your existing landline phone number, giving corporate users the ability to publish one number for Call & SMS. You can use this app to connect to the service and send unlimited SMS between messenger clients available for multiple platforms. You can send and receive text, picture, and voice clips to and from multiple Enterprise Messenger clients.
You may want to check out more software for Mac, such as Interaction Messenger, Go for Messenger: Voice & Text Message Chat or Mac Messenger, which might be related to Enterprise Messenger.