SUO: Dictionary and Thesaurus
Following is a discussion of some open-source resources:
http://groups.google.com/groups?th=3c477063910da12e
Among them is Oliver Steele's PyWordNet Python interface to WordNet:
http://pywordnet.sourceforge.net
Another is the Moby lexicon project:
http://www.dcs.shef.ac.uk/research/ilash/Moby/
This includes the Moby Hyphenator, Moby word lists in 5
different languages, Moby part-of-speech indicator,
Moby pronuciator, Moby Shakespeare, and Moby word list
of 610,000+ English words.
And
http://www.dict.org
John Sowa