Download of EtreZip 1.0.2 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within System Tools, more precisely File Compression. The actual developer of this Mac application is Etresoft. 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.
From the developer:
EtreZip allows you to open ZIP files directly in the Finder. After opening a ZIP file with EtreZip, you can access the ZIP file as if it were a network drive. The application provides full read and write access to the ZIP file without having to recompress.
You may want to check out more software for Mac, such as QXmlEdit, Compress PDF or RAR Extractor Star, which might be similar to EtreZip.