7Zip is an open source archiving utility currently supporting only Windows platform. It fully supports 7z, ZIP, GZIP, BZIP2 and TAR formats. Developed by Igor Pavlov
License: Open Source
The Unarchiver is a macOS-specific tool that excels in ease of use and format support, making it ideal for casual users. In contrast, 7-Zip offers a more comprehensive set of features, including robust compression options and cross-platform availability, making it suitable for advanced users and those needing more functionality.