PeaZip - Open source file and archive manager:
Create 7Z, ARC, BZ2, GZ, PAQ/ZPAQ, PEA, QUAD/BALZ, TAR, UPX, ZIP
Extract 95 archive types: ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF and many more
Shell (Windows Explorer) integration
Nice GUI
Cross-platform (Linux, Windows x86 & x64)
A portable version is available.
Operating PeaZip Portable is as easy
as dragging files. Drop a ZIP file on
the interface and PeaZip goes into
decompression mode. Drop a regular
file and it opens the archiving
screen. Well-labeled buttons and
simple functions make both processes
quick and painless. Adding files and
folders is also quickly accomplished
using function buttons and traditional
file browse tools.