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paq is a family of archivers with the best lossless compression ratios now available across a wide variety of test data, according to several benchmarks. A comparison of paq to other compression methods, on a 2GHz T3200, when compressing a large text file: Format Size Time (sec) Memory comp decomp ----------- --------- -------------- ------- Uncompressed 3,152,896 compress 1,319,521 1.6 0.2 .1 MB gzip -9 1,022,810 0.7 0.1 .1 MB bzip2 -9 860,097 0.6 0.4 5 MB p7zip (7z) 824,573 1.5 0.1 195 MB xz -6 822,016 ? ? ? zpaq c1 (fast) 806,959 2 2 38 MB zpaq c2 (mid) 699,191 8 8 112 MB zpaq c3 (max) 644,190 20 20 246 MB The port uses the open ZPAQ specification, and contains: a public-domain C++ API for reading and writing ZPAQ compressed data to or from files or objects in memory; serial and multi-threaded archivers; extra preprocessors for compression; and stubs for creating self-extracting archives.

Use of bzip2, which is intended to replace bzip, is recommended. The algorithms used in bzip2 are different and incompatible with those used in bzip. To open .bz archives, you must use bzip, and to open .bz2 archives you must use bzip2. Although bzip2 sometimes yields slightly larger output, it is faster, more reliable, maintained, much more widely used and is believed to be patent-free. Julian Seward, the author of bzip, gives this warning: This program may or may not infringe certain US patents pertaining to arithmetic coding and to the block-sorting transformation itself. Opinions differ as to the precise legal status of some of the algorithms used. Nevertheless, you should be aware that commercial use of this program could render you liable to unfriendly legal action.

grzip is a high-performance file compressor based on Burrows-Wheeler Transform, Schindler Transform, Move-To-Front, and Weighted Frequency Counting. It uses the Block-Sorting Lossless Data Compression Algorithm, which has received considerable attention in recent years for both its simplicity and effectiveness. This implementation has a compression rate of 2.234 bps on the Calgary Corpus (14 files) without preprocessing filters.

Unalz is a ZLIB-licensed unarchiver for AlZip format which requires proprietary and Win32-only software but widely used in Korea.

Simple command line implementation of PPMD compression algorithm. It is based on code by Dmitry Shkarin (archivers/ppmd) but reworked by Igor Pavlov and bundled with 7zip.

This package includes sq and usq, archivers for the CP/M "Squeeze" format compressed files. This is also found on some older MS-DOS files.

The hpack Multi-System Archiver is an archiver that was written to allow the transfer of archived data to differ- ent systems. In the past archivers have traditionally been available for single systems only, for example PKZIP and LHARC for the IBM PC, Larc for the Amiga, StuffIt and Compactor for the Macintosh, and tar and compress for UNIX systems (while these archivers are available on other systems, their use is not widespread). Open-keys security included.

A tiny C library and sample program to extract data compressed using dozen popular archivers. Currently following formats are supported: - tar (*.tar) - tar + gzip'ed (*.tar.gz, *.tgz) (deflate) - zip (*.zip) (implode, deflate) - lzh (*.lzh) (lh0, lh1, lh2, lh3, lh4, lh5, lh6, lzs, lz5, lz4) - MIME multipart

9e is a program to explore Plan9 archives. You can do whatever you like with the source so long as you clearly indicate all modifications and the author responsible for each. Usage Summary: $9e [options] <file> ... Options: -h: dump headers only -v: dump file names and sizes while extracting -r: specify alternate root directory -?: help If no file is named on the command line, standard input is assumed. Note that the input file must be a decompressed archive (decompress with gzip).

Orange is a tool and library for squeezing out juicy installable Microsoft Cabinet Files from self-extracting installers for Microsoft Windows. Supported installers include VISE, InstallShield, Setup Factory and more.