7-Zip

7-Zip Portable is the popular 7-Zip packaged as a portable app, so you can take your file archiver with you and work with your compressed 7z, ZIP, GZIP, BZIP2, TAR, RAR files and more on the go. You can place it on your USB flash drive, iPod, portable hard drive or a CD and use it on any computer, without leaving any personal information behind.

The main features of 7-Zip

# High compression ratio in new 7z format with LZMA compression
# Supported formats:
# Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
# Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, 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 PKZip and 

WinZip

# Self-extracting capability for 7z format Integration with Windows Shell
# Powerful File Manager
# Powerful command line version
# Plugin for FAR Manager
# Localizations for 63 languages

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