What's segment/tagging library used in languagetool

As title. I own a project which feed in tradition Chinese sentences. But the languagetool support only simple Chinese rules. So I may have to handle the difference between them. So I am curious about the segment/tagging library used in languagetool…

Thanks in advance!

We’re using ictclas4j (http://code.google.com/p/ictclas4j/). Please let
us know if you extend/improve it.

Thanks.
I will.