WordNet-Online dictionary
WordNet-Online free dictionary and hierarchical thesaurus of English. Very easy to use! Definitions, synonyms, antonyms, hypernyms, hyponyms, meronyms, holonyms, derived forms and sample sentences. The handy dictionary software minimizes to your system tray and waits until you click it. ... keywords: WordNet, dictionary, thesaurus, reference, encyclopedia, hierarchical, free, ontology, definition, synonym, antonym, kind-of, part-of. ... WordNet top-level concepts: entity, psychological feature, abstraction, state, event, act, human action, human activity, group, grouping, possession,...
http://www.wordnet-online.com/downloads/WordNet-Online_setup.exe - 468Kb - Download - Screenshot

Talking Dictionary
Talking Dictionary is a speech enabled encyclopedic dictionary that can be used with or without a screen reader. The dictionary is based on the Wordnet 2. 1 database and contains over 250,000 words. These include historical figures, slang and jargon. ... Can search for words when letters are missing from the input. ... Spell checker rewritten and improved. ... For partially sighted users the text size can easily be adjusted. ... Has new voices that can easily be installed. ... Many more new features.
http://www.rwfts.com/tdict.exe - 9Mb - Download - Screenshot

Mobysaurus
Mobysaurus is a free, feature-rich English thesaurus and dictionary software that integrates Moby Thesaurus II, Roget's Thesaurus, GCIDE Dictionary and WordNet -- all royalty-free, powerful and most suitable for everyday reference. With this, you will feel it so much easier to choose the... Unlimited Copy/Export 13. ... Convenient look-up utility 12. ... Bookmark & History 11. ... Handy Online References 14. ... Rich Offline References 15. ... donationcoders. ... Free for all Please visit product homepage for more information: http://moby.
http://moby.donationcoders.com/files/beta1/1024/moby24beta1.exe - 16Mb - Download - Screenshot

English Dictionary with Thesaurus (UIQ)
English explanatory dictionary with extended thesaurus for Sony Ericsson devices,contains 140489 entries. This dictionary is based on WordNet lexical database by the Cognitive Science Laboratory at Princeton University. Main features of English SlovoEd software dictionary for Sony Ericsson are:... -Search history (last words that you? ... -The possibility to save certain words on Flash Cards (a special method of learning new foreign words) and then pass through Flash Cards Quiz. ... -Support of color marks for dictionary entries.
http://www.penreader.com/download/00FB_SlovoEd_EN-EN_[WordNet].zip - 12Mb - Download - Screenshot