nexxOMNIA 2.3.10 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. We recommend checking the downloaded files with any free antivirus. The program lies within Audio & Video Tools, more precisely Streaming Media. This free software for Mac OS X is an intellectual property of 3Q nexx GmbH.
From the developer:
nexxOMNIA is the macOS App Store version of the video management tool nexxOMNIA. For using this application, you need a 3Q nexx GmbH account. It is not possible to register within the App itself. The current version comes with an updated UI and security enhancements.
You may want to check out more software for Mac, such as PlayPod, ffmpeg or FMDiff 2, which might be similar to nexxOMNIA.