Hello,
It depends in which version ?
The tagged version, I think, is included in the distribution of the
Natural Language Toolkit (http://nltk.sourceforge.net/) and it is free !
Regards.
--
Alexandre Allauzen
ATER Paris XI, LIMSI-CNRS
Tel : 01.69.85.80.64 (80.88)
Bur : 114 LIMSI Bat. 508
allauzen at limsi.fr