This is a simple and basic outline for a chronological list of computers constructed from 1938 (with the Konrad Zuse "Z1" in Germany) through the Alliant series in 1988.
Key: listings are by Maker/Name of the computer/Country of origin/Year
Example: Zuse Z1 Germany 1938 (So, the ZI computer made in 1938 by Konrad Zuse, in Germany)
Here's a terrific piece of work called "The Computer Tree", from Electronic Computers Within the Ordnance Corps , by Karl Kempf. "U.S. Army Diagram", the source of this information coming from the U.S. Army, here.
This image is expandable.
I've found a supplement for computer tree above. . The new one is interesting and has its differences from its predecessor, and divides its generations of computers in terms of logic technology. It is found in a 1960 NSF pamphlet called "The Family Tree of Computer Design", a Brief Summary of Computer Development, and I found its reference in a good book by I.B. Cohen, Howard Aiken, Portrait of a Computer Pioneer, published by MIT and available here.
[Image source: Microsoft.]