Info-ZIP provides free, portable, high-quality versions of the Zip and UnZip compressor-archiver utilities that are compatible with the DOS-based PKZIP by PKWARE. Info-ZIP supports hardware from microcomputers all the way up to Cray supercomputers, running on almost all versions of Unix, VMS, OS/2, Windows 9x/NT/etc. (a.k.a. Win32), Windows 3.x, Windows CE, MS-DOS, AmigaDOS, Atari TOS, Acorn RISC OS, BeOS, Mac OS, SMS/QDOS, MVS and OS/390 OE, VM/CMS, FlexOS, Tandem NSK and Human68K (Japanese). There is also some (old) support for LynxOS, TOPS-20, AOS/VS and Novell NLMs. Shared libraries (DLLs) are available for Unix, OS/2, Win32 and Win16, and graphical interfaces are available for Win32, Win16, WinCE and Mac OS.
StuffIt Expander for Macintosh is a freeware program. StuffIt Expander can expand Stuffit (.sit, sea), BinHex (.hqx), MacBinary (.bin), ZIP/GZip (.zip, .gz, .tgz), UU (.uu, uue, .enc), Private File (.pf), and Disk image (.img, .smi) files. When transferring files between different systems (Mac, IBM, or Unix), it is recommended that the BinHex (.hqx) format be used.
StuffIt Expander for Windows 95, 98, NT 4 is a freeware program and is similar to StuffIt Expander for Macintosh, in that it gives users an easy way to expand StuffIt archives and other compressed or encoded files, especially those found on the Internet. It supports the following formats: ARC (.arc), Arj (.arj, .pak), BinHex (.hqx), Gzip (.gz, z), MacBinary (.bin), MIME (Base64) (.im, mime, .b64), Private File (.pf), StuffIt (.sit, .sea), UUcode (.uu, .uue), ZIP (.zip). StuffIt, Zip, and Arj self-extracting archives (.exe, .sea) and StuffIt segmented archives are also supported.
Also see Program Downloads.