UHBC is a blocksorting compressor optimized for high compression ratios. The program uses recent research results by S. Deorowicz and J. Abel for improved second stage processing after the BWT. Some extensions and sophisticated modeling provide top compression ratios, giving the best known result for Calgary Corpus (2.208 bps average). UHBC is free for non-commercial use. No source available.

Reader Grebnov I. had this to say: Compression is very good, but too slow + no source code..

ftp://ftp.elf.stuba.sk/pub/pc/pack/uhbc10.zip