J'aime beaucoup cmix ( http://www.byronknoll.com/cmix.html ) (le premier de la liste sut http://mattmahoney.net/dc/text.html) :

It also has state of the art results
At least 32GB of RAM is recommended to run cmix.
enwik9 1000000000 123930173 344244.32 30311032 (soit 1Go de données compressés en 4 jours !!!!).
Compression and decompression time are symmetric