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 atbzip2libbzip2data compression softwarecompressorlossless data compressionburrows-wheeler transformportableData Compression
Presents this free, open source archiver featuring volume spanning, authenticated encryption and compression in several formats. Includes download links, documentation and a support forum.
Utility to convert any ZIP file into a self-extracting executable. Supports AES encryption, can unpack automatically to a temporary directory and run a setup.exe after extraction.