Notable PAQ derivatives include: WinUDA 0.291, based on PAQ6 but faster UDA 0.301, based on PAQ8I algorithm KGB, based on PAQ6 (beta version is based on PAQ7). Emilcont based on PAQ6 Peazip GUI frontend (for Windows and Linux) for LPAQ, ZPAQ and various PAQ8* algorithms PWCM (PAQ weighted context mixing) is an independently developed closed source implementation of the PAQ algorithm used in WinRK. PAQCompress is a graphical user interface for several newer PAQ versions, including the latest releases of PAQ8PX, PAQ8PXD and PAQ8PXV. It is updated whenever a new version is released. The software intelligently appends an extension to the filename which it can use to decompress the file using the correct PAQ Version. The software is open source. PerfectCompress Is a compression software which features UCA (ULTRA Compressed Archive). A compression format that featured PAQ8PX v42 to v65 and that now can use PAQ8PF, PAQ8KX, or PAQ8PXPRE as the default UCA Compressor. In addition, PerfectCompress can compress files to PAQ8PX v42 to v67, and ZPAQ, and as of version 6.0, can compress files to LPAQ and PAQ8PF beta 1 to beta 3. PerfectCompress v6.10 introduced support compression for the recently released PAQ8PXPRE. PerfectCompress 6.12 introduces support for the PAQ8KX series. FrontPAQ, small gui for PAQ. Latest version is FrontPAQ v8 supporting PAQ8PX, PAQ8PF, and FP8. The software is no longer updated and users are encouraged to use PAQCompress, which implements the latest PAQ releases. See also List of archive formats Comparison of file archivers References Further reading David Salomon, Giovanni Motta, (with contributions by David Bryant), Handbook of Data Compression, 5th edition, Springer, 2009, , 5.15 PAQ, pp. 314–319 Byron Knoll, Nando de Freitas, A Machine Learning Perspective on Predictive Coding with PAQ, University of British Columbia, Vancouver, Canada, August 17, 2011 External links Compiled linux binaries - Linux command-line executables download. Free data compression software Lossless compression algorithms