7Zip is an open source software that unzips compressed files in numerous formats. 7Zip free download operates with7Z, a compressed archive file format that supports several different data compression, encryption and pre-processing filters. The free download of 7-Zip unpacks a host of archive formats, including ZIP, TAR, GZ, and its own 7z format. Unlike WinZip, though, 7-Zip software can create TAR and GZ archives, which are commonly used on Unix and Linux systems. This software has shown to shrink files 40% more than there competition. Advanced options include the ability to create solid and self-extracting archives, and to adjust the compression level and password protection. The layout of the software is fairly simple, but very easy to use. 7Zip free download is suited best for developers and anyone using Windows or Linux.