The Link Grammar Parser is a syntactic parser of English, based on link grammar, an original theory of English syntax. Given a sentence, the system assigns to it a syntactic structure, which consists of a set of labeled links connecting pairs of words. The parser also produces a “constituent” representation of a sentence (showing noun phrases, verb phrases, etc.).
via Link Grammar.
This WordNet module (WordNet::QueryData) is a Perl interface to the WordNet database. WordNet is a database of word meanings and lexical relationships. It contains tens of thousands of words and numerous semantic relationships for each. For example, it can tell you that a limousine is a type of a car and that a car is a type of motor vehicle. It can also tell you that car and automobile have essentially the same meaning.
via WordNet Perl Module.