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WordNet® is a large lexical database, where words are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept. Synsets are interlinked by means of conceptual-semantic and lexical relations.

A Complete Multilingual WordNet List by Language  Samuel Chong
English WordNet  
eXtended WordNet XWN   - In the eXtended WordNet the WordNet glosses are syntactically parsed, transformed into logic forms and content words are semantically disambiguated.
extJWNL (Extended Java WordNet Library)   - a Java API for creating, reading and updating dictionaries in WordNet format.
Global WordNet Association   - The Global WordNet Association is a free, public and non-commercial organization that provides a platform for discussing, sharing and connecting wordnets for all languages in the world.
ImageNet   - ImageNet is an image database organized according to the WordNet hierarchy (currently only the nouns), in which each node of the hierarchy is depicted by hundreds and thousands of images.
JWI the MIT Java Wordnet Interface   - A very cool Java WordNet API.
JWNL: Java Wordnet Library  
MultiWordNet (Italian)  
RiTa   - an easy-to-use toolkit for experiments in natural language and generative literature. It includes text-generation via CFGs and Markov chains; taggers for syllables, phonemes, stress, POS. Rita also provides a Java-API for WordNet and morphology modules.
wn   - a non-NLTK version of Python interface to WordNet.
WordNet APIs in different languages  
WordNet Related projects