eMastering 4.130 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. EMastering for Mac lies within Audio & Video Tools, more precisely Editors & Converters. We recommend checking the downloaded files with any free antivirus. This free Mac application was originally produced by Sterling-sound.
From the developer:
The new of Sterling's eMastering Reference Player is available for Mac only. The player allows clients to listen to and approve DDP images directly from their Mac. With a DDP image (unlike individual WAV files), clients can check the gaps, fades, start/stop points and ISRC's
You may want to check out more Mac applications, such as eMastering DDP Player, which might be similar to eMastering.