Best Freeware 2008 : 7-Zip 4.57 Compression Software

The main features of 7-Zip :

1. High compression ratio in new 7z format with LZMA compression.
2. Packing/unpacking format : 7z, ZIP, GZIP, BZIP2 and TAR.
3. Unpacking format only : RAR, CAB, ISO, ARJ, LZH, CHM, MSI, WIM, Z, CPIO, RPM, DEB and NSIS.
4. For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 % better than ratio provided by PKZip and WinZip.
5. Self-extracting capability for 7z format.
6. Integration with Windows Shell.
7. Powerful File Manager.
8. Powerful command line version.
9. Version 4.57 supports WinZip-compatible AES-256 encryption for .ZIP archives and 7-Zip can unpack MSI and WIM archives now.
10. Also there are some speed optimizations.

OS Support : Windows 98/Me/NT/2000/2003/XP/Vista
Download Link : 7-Zip 4.57