This stuff is in English although my native language is German. This is an explanation why. It goes along the roads of ELFE but concentrates on my personal view. It would be obviously pointless to write this in English as well, so I'm switching to German here.
WordNet is a large lexical database of English, developed under the direction of George A. Miller. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept.
he Visual Thesaurus is an interactive dictionary and thesaurus with an innovative display that encourages exploration and learning. Multiple languages can be display in one cloud!