Class-nlp-project is a project mainly written in PYTHON and PERL, it's free.
Code from the final project of CS388, Natural Language Processing
First you'll want to install the Python Natural Language toolkit.
$ mkdir ~/.pylibs
$ easy_install-2.6 --install-dir=~/.pylibs dist/nltk-2.0.1rc1-py2.6.egg
We're trying out pybing and gensim. To install that, do
$ easy_install-2.6 --install-dir=~/.pylibs dist/pybing-0.1dev_r34-py2.6.egg
$ easy_install-2.6 --install-dir=~/.pylibs dist/gensim-0.7.8-py2.6.egg
$ python listwords.py wordnet/1.6/