From Securenet :
Compress files with QuickRAR and save a lot of disk space. QuickRAR provides a compression ratio that is even 2-10% better than the ratio provided by PKZip and WinZip. It has a strong AES-256 encryption. There are also other formats supported like 7z, ZIP, GZIP, BZIP2 and TAR (packing and unpacking) and ARJ, CAB, CHM, CPIO, DEB, DMG, HFS, ISO, LZH, LZMA, MSI, RAR, RPM, UDF, WIM, XAR and Z (packing). QuickRAR is free. After a quick installation you can choose one of 74 languages. All kinds of formats are supported. You can even open RAR archives. The integrated ZIP compression was improved again and guarantees you an excellent compression rate. QuickRAR comes with many features like self-extracting capability for 7z, integration with windows shell, a powerful file manager next to a command line version.