http://www.bzip.org/Patent free, high-quality data compressor for Windows or Unix.Official Home Page for bzip2, the high-quality, open-source data compressor. The current stable version is bzip2 1.0.4.
bzip2 is a freely available, patent free (see below),
high-quality data compressor. It typically compresses files to
within 10% to 15% of the best available techniques (the PPM
family of statistical compressors), whilst being around twice as
fast at compression and six times faster atData Compressionbzip2libbzip2data compression softwarecompressorlossless data compressionburrows-wheeler transformportable
Windows compression utility using the ARJ format (was called ArjFolder). Can extract, test, and view files stored in ZIP, GZIP, TAR, CAB, RAR, ACE, PK3, etc. and create SFX executables.