7-Zip - the free file archiver software.

7-zip

7-Zip is a free file archiver with a very high compression ratio. The current release 3.13 is onlt 920 KB in file size. Some features include the new 7z format format which gives extremely high compression rates. Improved compression ratios for traditional compression formats like ZIP and GZIP, Localization for 51 languages, with usual features like windows shell integration, self-extractor creation and command line. I have just started using it - looks quite good.