To recommend this program to open .zip and .rar files which you can download the Mac App Store.
And it is also free!
StuffIt Expander is always free. Access StuffIt files, uncompress Zip archives, decompress tar, gzip and bzip archives, and more. Just drag, drop, and you’re done! From BinHex to Zip, StuffIt to MIME, Expander accesses more formats, in less time, with zero hassles.
If you need to create or password protect Zip or StuffIt archives, StuffIt Destinations is the perfect solution. Available here on the App Store, see our other products below.
download StuffIt Expander