PPMd is a compression library implementing efficient PPMII algorithm. It provides very high compression ratio and quite speedy. It's the fastest PPM-like compression algorithm implementation today. PPMd is used in RAR, 7-Zip, WinZip and other compression utilities. As of Feb. 2006, the latest variant is ver. J. The older versions can be downloaded from the author's
page'>http://www.compression.ru/ds/">page also (Russian language, but quite readable to find download links).
