Konrad Zuse's Helix Tower [pdf]

Also the electromechanical computers of Howard Aiken (made by IBM at Harvard, hence "Harvard architecture"), which were conceived as a modern implementation of the ideas of Babbage, and which preceded ENIAC, resembled much more a modern computer than ENIAC.

ENIAC, as actually said by its name (Electronic Numerical Integrator) was an electronic and digital version of the mechanical analog computers known as "differential analyzers", e.g. that of Vannevar Bush.

ENIAC was not as special purpose as the British Colossus, but it was not as general-purpose as the electromechanical computers of Aiken and Zuse that preceded it, which were really controlled by writing programs, not by reconfiguring a bunch of connections. ENIAC was more like an FPGA than like a computer.

The main connection between ENIAC and later electronic computers was in the digital electronic circuits used to built it, however even those were not completely original, as they have used information from the circuits used in the previous special-purpose electronic computer of John Vincent Atanasoff at Iowa State University, which in turn were based on the digital circuits invented in UK for the necessities of nuclear and elementary particle physics research during the decade preceding WWII.