7zX 1.7.1 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. This application's bundle is identified as com.sixtyfive.7zX.
The following version: 1.7 is the most frequently downloaded one by the program users. This free software for Mac OS X is an intellectual property of Sixty Five Ltd. The application relates to System Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
7zX is a file archiver with high compression ratio. Compression ratio results are very dependent upon the data used for the tests.
Usually 7zX compresses to 7z format 30-70% better than to zip format, and 2-10% better than most of other zip compatible programs.
7zX currently supports tar, zip, gzip, bzip2, UNIX compress, 7z, s7z and various kinds of segmented archives.
You may want to check out more software for Mac, such as StuffIt Expander, which might be related to 7zX.