Couplet 1.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application is categorized as System Tools. This free Mac application was originally designed by Moore Development. 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:
Couplet offers a convenient way to manage digital content for Apple TV using a powerful suite composed of familiar tools. It provides an easy solution to manage digital content on a collection of Apple TVs. Everything can be managed and customized directly via Couplet, so all you need is an asset as the centerpiece.
You may want to check out more software for Mac, such as RadarScope, which might be similar to Couplet.