The 1.0.0 version of Emmerge for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Communication Tools, more precisely E-mail. We recommend checking the downloaded files with any free antivirus. This free Mac application is a product of Emmerge Inc.
From the developer:
Emmerge is an app that lets you manage your tasks and e-mails easily. The program integrates your Inbox with Slack. With the push of a button, you can share any message and its attachments to a Slack channel or via direct message. Emmerge includes shared task lists and offers an easy way to send tasks from Slack to Emmerge. The tool works with all major e-mail providers including iCloud, Gmail, Yahoo!, Exchange, and Office 365.
You may want to check out more software for Mac, such as SkypeMW, Zimbra Toaster or Enough, which might be similar to Emmerge.