This program implements a new algorithm for data compression (Burrows / Wheeler + adaptative Huffman coding). With this new algorithm, and the ability of grouping small files before compressing them, this new release achieves one of the best compression ratio available today. The old algorithm (LZ77 + adaptative Huffman coding) is still provided.
Pac ranks now among the 100 best compressors. You see more about it at http://www.maximumcompression.com/.