MergeX 1.2 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 Audio & Video Tools, more precisely Editors & Converters. 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. This Mac app is an intellectual property of The Sync Factory.
From the developer:
MergeX will merge two Final Cut Pro X events, combining keywords, ratings, metadata, etc... for every matched clip. The resulting merged clips will be updated in the projects.
To take the simplest example, provided two occurrences of a same clip but with different keywords and ratings, MergeX will output a single clip embedding both inputs' keywords, ratings and more!