There is ZipIt for Mac. Link: http://www.maczipit.com/ Here is the info the page: What is ZipIt? ZipIt is a Macintosh program that zips and unzips archives in a format fully compatible with PKZip for the IBM and zip implementations on other systems. ZipIt is a Macintosh program ZipIt features a complete Macintosh interface, based on the interface provided by Bill Goodman's Compact Pro. That means that, if you can use Compact Pro, you can already use ZipIt. If you are new to the Macintosh, ZipIt's interface should still be easy to figure out; but it also comes with an extensive manual that explains how to use all of its features. Zip archives A zip archive is any file that ends with the extension '.zip'. The zip format is popular on the IBM, and is widely used as an interplatform compression format. In addition, ZipIt can compress Macintosh applications and documents without losing any of their data. ZipIt is best used when transferring compressed documents to and from other computer types. Some examples are: text files, TIFF pictures, Excel databases, and QWK message packets, to name just a very few. Note that files that end in '.Z' or '.gz' are not ZipIt files, even though Netscape may give them a ZipIt icon. ZipIt is fully compatible with all versions of PKZip on the IBM, Info-ZIP on Unix, and zip implementations on other platforms. Shareware ZipIt is $15 shareware. You are encouraged to try it out before paying. All features are available in the unregistered version, with the exception, due to US export laws, of encryption. Once you register, you will receive a password that will cause the seven-second registration screen to stop appearing. In addition, if you register from the United States or Canada, your password will enable the encryption capabilities of ZipIt.