7-Zip is a file archiver/compression tool which can achieve very high compression ratios with its native format, and improved compression ratios over PKZip/WinZip. Features support for: 7z, ZIP, CAB, RAR, ARJ, GZIP, BZIP2, TAR, CPIO, RPM and DEB. http://www.7-zip.org/

IZArc is an easy to use archiver that supports many compressed file-formats including 7-ZIP, ARJ, B64, BZ2, CAB, GZ, JAR, LHA, RAR, TAR, UUE, ZIP (along with many others). Features archive testing, repair, conversion, file search, disk spanning, encryption. http://www.izarc.org/