FreeArc is free open-source archiver with command-line and GUI
versions for Windows and Linux. It features solid archives with smart
updating, AES+Twofish+Serpent encryption, recovery record, 1gb
dictionary, LZMA/PPMd/Multimedia compression, creation of SFX-es and
installers, and lot of other features.
FreeArc was ranked as the most efficient compressor in
maximumcompression.com multiple-file test.
New version provides stable GUI and efficiency improvements.
Further details are available at http://freearc.org/News.aspx