[jbranchaud]

As far as NLP libraries in Ruby land, there is both [treat](https://github.com/louismullie/treat) and [ruby bindings to the Stanford Core NLP](https://github.com/louismullie/stanford-core-nlp).

[otobrglez]

I've used OpenNLP with jRuby for my NLP experiment. Check it out https://github.com/otobrglez/politiki-ner to get an idea how to mix it.