Windows 
Linux 
MacOSX 
7-Zip is a powerful open source file compression / decompression software similar to WinZip and Winrar. Its main features are:
- supported formats:
- packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
- unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, MSI, WIM, Z, CPIO, RPM, DEB and NSIS
- for ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by WinZip.
- encryption for 7z and ZIP formats
- self-extracting capability for 7z format
- integration with Windows Shell
- powerful file manager
- translated into many languages
7-Zip screenshots
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