Downloading OSMC 1.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. OSMC for Mac is categorized as Audio & Video Tools. We recommend checking the downloaded files with any free antivirus. This free Mac app was originally developed by OSMC.
From the developer:
This app lets you play back media from your local network, attached storage, and the Internet. The app can play all major media formats out there and supports a variety of sharing protocols so you’re guaranteed to be able to stream from other devices.
You may want to check out more software for Mac, such as Filmkey Player, which might be related to OSMC.