Who's on First?

There are several calculating machines that are claimed to be the "first computer".  These claims depend on what is meant by "computer" and, to some extent, on what is meant by "first".

Among the contenders for "first computer" are Charles Babbage's Analytical Engine, Konrad Zuse's Z3, Tommy Flowers' Colossus codebreaking machine, The Atanasoff-Berry Computer, Howard Aiken's Harvard Mark I, Eckert and Mauchly's Eniac, The Manchester Baby, The Manchester Mark 1, Maurice Wilkes' Edsac, and The Pilot ACE.

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