Master for iTunes Droplet 1.5 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within System Tools, more precisely Plugins & Addons.
The common filename for the program's installer is apple_audio_mastering_tool.zip. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The most popular version among the application users is 1.1. This free software for Mac OS X was originally produced by Apple Inc.
From the developer:
The Mastered for iTunes droplet is a simple, standalone drag-and-drop tool that automates the creation of iTunes Plus format masters, allowing for a preview of songs using the same world-class technology used to encode the entire catalog for the iTunes Library.
You may want to check out more software for Mac, such as Shiny Droplets, Quick Look Droplet or Video Converter Master, which might be similar to Master for iTunes Droplet.