7-Zip

7-Zip is a Open Source file archiver with high compression ratio.

Features:

- high compression ratio in new 7z format with LZMA compression.
- supported packing/unpacking formats: 7z, ZIP, GZIP, BZIP2 and TAR.
- supported unpacking format: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS.
- self-extracting capability for 7z format.
- integration with Windows Shell.
- powerful file manager.
- powerful command line version.