7-Zip is a file archiver with a high compression ratio. The program supports 7z, ZIP, RAR, CAB, GZIP, BZIP2, and TAR formats. Compression ratio in the new 7z format is 30-50% better than ratio in ZIP format. It also compresses to ZIP 2-10% better than PKZip and WinZip. It has an additional powerful command line version and FAR Manager support.
Changes in 7-Zip 9.09 ( 2009-12-12):
* 7-Zip now can unpack Apple Partition Map (APM) disk images.
* Speed optimizations in AES code for Intel's 32nm CPUs.
* Speed optimizations in CRC calculation code for Intel's Atom CPUs.
* Some bugs were fixed.
* VHD support was improved.
* Some bugs were fixed.
Don't use this alpha version for important data. Call "Test" command after each compressing operation.
Homepage - http://www.7-zip.org