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Unzip will list, test, or extract files from a ZIP archive, commonly found on MS-DOS systems. The default behavior (with no options) is to extract into the current directory (and subdirectories below it) all files from the specified ZIP archive. Unzip is compatible with archives created by PKWARE's PKZIP, but in many cases the program options or default behaviors differ. Zipinfo lists technical information about files in a ZIP archive, most commonly found on MS-DOS systems. Such information includes file access permissions, encryption status, type of compression, version and operating system or file system of compressing program, and the like. Funzip acts as a filter; that is, it assumes that a ZIP archive is being piped into standard input, and it extracts the first member from the archive to stdout. If there is an argument, then the input comes from the specified file instead of from stdin. Unzipsfx may be used to create self-extracting ZIP archives from previously created ZIP archives.

Unzoo is a zoo archive extractor written by Martin Schoenert. If unzoo is called with no arguments, it will first print a summary of the commands and then prompt for command lines interactively.

UPX is a free, portable, extendable, high-performance executable packer for several different executable formats. It achieves an excellent compression ratio and offers very fast decompression. Your executables suffer no memory overhead or other drawbacks because of in-place decompression. UPX is copyrighted software distributed under the terms of the GNU General Public License, with special exceptions granting the free usage for commercial programs as stated in the UPX License Agreement.

Linux ports of KZIP and ZIPMIX by Ken Silverman. A PKZIP-compatible compressor focusing on space over speed. KZIP creates smaller .ZIP files than PKZIP with maximum compression enabled and even beats 7-Zip most of the time.

LHa for UNIX with autoconf

XArchive is a GTK+ front end for command line archiving tools such as tar, rar, zip, ace, 7zip, arj, and rpm. It uses external bash shell wrappers to handle the different types of file formats, so adding support for new archive types can be easily done by writing a wrapper.

xDMS is an archiver unpacker for the Amiga DMS file format. It supports decompression of files compressed using all known DMS compression modes, including old and obsolete ones, and also encrypted files, for 100% compatibility.

XMill is a new tool for compressing XML data efficiently. It is based on a regrouping strategy that leverages the effect of highly-efficient compression techniques in compressors such as gzip. XMill groups XML text strings with respect to their meaning and exploits similarities between those text strings for compression. Hence, XMill typically achieves much better compression rates than conventional compressors such as gzip.

This the Unix port of the Amiga XPK library. The XPK system consists of a master library (libxpkmaster.so) and several (un)packer sublibraries (libxpkXXXX.so). Application programs only use the master library directly: the master library takes care of loading and using the sublibraries. Each sublibrary implements one type of compression. There are different libraries for different types of data. When unpacking the applications do not need to know which library was used to pack the data -- the appropriate library needs to be installed.