Still using WinZip, WinRAR or some commercial archive? Try 7-Zip. It is opensource and free.
Do not be deceived by the name which may make it sounds like it is yet another Zip clone and only read zip file. 7-Zip introduces a new format called 7z and also supports ZIP, CAB, RAR, ARJ, GZIP, BZIP2, Z, TAR, CPIO, RPM and DEB format.
The 7z format produces very good compression ratio. Compression ratio is the ratio of the difference between the compressed file size and the uncompressed file size to the uncompressed file size. I had been using 7-zip for a good few years now and the format consistently beat other format like zip (worst), rar or even tar.bz2.
The one drawback of 7z is that not many people know or use the format. So I cannot, for example, email a .7z file to a friend. My friend probably get an “Unknown file type” error. But this should change soon. Expect to see more programs supporting the 7z format. WinRAR already support it and so does a number of compression utilities.
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