With iUnarchive, you can create, modify and open archives.
Instead of cluttering the disk with files, you can preview and open files directly from within iUnarchive. Only files selected for preview and extracted files are actually uncompressed.
If an archive contains another archive, you can choose to open the nested archive with iUnarchive.
Archives that can be opened by iUnarchive include zip, rar, 7-zip, tar, gzip, bz2/BZip2, LhA and StuffIt, including password protection for zip, 7-zip, rar and multi part rar.