Well they are new to me at least :)

WorldNet - a lexical database for the english language
"WordNet® is an online lexical reference system whose design is inspired by current psycholinguistic theories of human lexical memory. English nouns, verbs, adjectives and adverbs are organized into synonym sets, each representing one underlying lexical concept. Different relations link the synonym sets."
hat tip Dan @ SEW forums

ConversionLabs Keyword List Builder
found at SEW forums

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