The 1.7.1 version of 7zX for Mac was available as a free download on our website. The actual developer of this free Mac application is Sixty Five Ltd. The most popular version of the application is 1.7. The application lies within System Tools, more precisely File Compression. This application's bundle is identified as com.sixtyfive.7zX.
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.