#dictionary
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Where words came from, in short entries with dates. 'Nice' used to mean foolish; read the whole story before using it on someone.
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A reverse dictionary: describe the meaning, get the word. Also a thesaurus that knows about 'the feeling of a place you are about to leave'.
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A dictionary that collects every definition and real example sentence it can find, including for words that have not made it into other dictionaries yet.
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The hacker's dictionary, grown since 1975: what 'foo' means, why there is a 'bar', what a 'bogon' is. Read the glossary like a novel.