The Unarchiver on Mac OS and 7-Zip on Windows are free unzip tools that users can download. Neither application has a version for the other operating system.
Whereas the Unarchiver is only available for 64-bit systems, 7-Zip has both 32-bit and 64-bit versions. Users must make sure that they download the correct version of 7-Zip, as the 64-bit version does not run on 32-bit systems and the 32-bit version performs poorly on 64-bit systems. The poor performance is due to the RAM limitations of 32-bit operating systems.
Beta versions of 7-Zip are also available. Beta applications generally offer more features but are sometimes unstable.