7-Zip is free software with open source. The most of the code is under the GNU LGPL license. Some parts of the code are under the BSD 3-clause License. Also there is unRAR license restriction for some parts of the code. Read 7-Zip License information.
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iZip is the easiest way to manage ZIP, ZIPX, RAR, TAR, 7ZIP and other compressed files on your Mac. Best of all it's completely free so you can zip, unzip & unrar your files without limitations!
iZip supports all the major modern archive formats like ZIP, RAR, 7ZIP, TAR, BZ2 and XZ, including fully encrypted archives. Simply open an archive with iZip to quickly browse, view and extract.
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p7zip is a port of 7za.exe for POSIX systems like Unix (Linux, Solaris, OpenBSD, FreeBSD, Cygwin, AIX, ...), MacOS X and also for BeOS and Amiga.
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