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Wiktionary - EN
About Welcome to the English-language Wiktionary, a collaborative project to produce a free, multilingual dictionary with definitions, etymologies, pronunciations, sample... -
Oxford English Dictionary (OED)
Scans of the first edition of the Oxford English Dictionary (1888) along with some software to search those scans. The post details work up to volume 6 (as of March 2006) and it... -
FreeDict
About Summary from SourceForge page: Free translating dictionaries. The data is kept as XML complying to the TEI DTD. This enables to include features such as phonetics, part... -
dict.org: Dictionary Related Material
Description A set of dictionary related material (definitions, thesauri, jargon files etc) bundled together with an API. A full list of the data included can be found on this... -
Apertium
About From the about page: Apertium is a free/open-source machine translation platform, initially aimed at related-language pairs but recently expanded to deal with more...