Open source syntactic parser of English and other languages
Link Grammar Parser is a free and open source syntactic parser of English (and other languages as well), 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 labelled links connecting pairs of words.
The parser also produces a "constituent" (Penn tree-bank style phrase tree) representation of a sentence (showing noun phrases, verb phrases, etc.). The RelEx extension provides dependency-parse output.