TurboParser - Dependency Parser with Linear Programming

Link: http://www.ark.cs.cmu.edu/TurboParser/

Intro: TurboParser is a free C++ implementation of a multilingual non-projective dependency parser based on linear programming relaxations.

PML Tree Query

Link: http://ufal.mff.cuni.cz/~pajas/pmltq/

Intro: PML-TQ is an powerful open-source search tool for all kinds of linguistaically annotated treebanks with several client interfaces and two search backends (one based on a SQL database and one based on Perl and the TrEd toolkit). The tool works natively with treebanks encoded in the PML data format (conversion scripts are available for many established treebank formats).

DependenSee - A Dependency Parse Visualization Tool

http://chaoticity.com/dependensee-a-dependency-parse-visualisation-tool/

Stanford Biomedical Event Parser

http://nlp.stanford.edu/software/eventparser.shtml

David McClosky, Mihai Surdeanu, and Christopher D. Manning. 2011. Event Extraction as Dependency Parsing. In Proceedings of the Association for Computational Linguistics - Human Language Technologies 2011 Conference (ACL-HLT 2011). [PDF]

RelEx Dependency Relationship Extractor

Link: https://launchpad.net/relex/

Documentation: http://wiki.opencog.org/w/RelEx

RelEx is an English-language dependency relationship extractor, built on the Carnegie-Mellon link parser. It can identify subject, object, indirect object and many other dependency relationships between words in a sentence. It also generates some advanced semantic relations, such as normalizing questions for question-answering. It also proposes "frames" or "semantic roles", similar in style to those of FrameNet. RelEx includes a basic implementation of the Hobbs anaphora (pronoun) resolution algorithm. As a "by-product", it also provides more basic functions, including entity detection, part-of-speech tagging, noun-number tagging, verb tense tagging, gender tagging, and so on. Relex now includes a Stanford parser compatibility mode, generating identical output, but more accurately and more quickly.

TurboParser - Dependency Parser using Integer Linear Programming

http://www.ark.cs.cmu.edu/TurboParser/

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Cheers,
Vu