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* [[APEXC|ARC2]], a relay machine developed by [[Andrew Donald Booth|Andrew Booth]] and [[Kathleen Booth]] at [[Birkbeck, University of London]], officially came online on 12 May 1948.<ref name="birkbeck">{{cite journal|last1=Campbell-Kelly|first1=Martin|title=The Development of Computer Programming in Britain (1945 to 1955)|journal=IEEE Annals of the History of Computing|date=April 1982|volume=4|issue=2|pages=121–139|doi=10.1109/MAHC.1982.10016|s2cid=14861159}}</ref> It featured the first [[drum memory|rotating drum storage device]].<ref>{{cite book|editor1-last=Lavington|editor1-first=Simon|title=Alan Turing and his Contemporaries: Building the World's First Computers|date=2012|publisher=British Computer Society|___location=London|isbn=9781906124908|page=61}}</ref><ref>{{cite web|last1=Johnson|first1=Roger|title=School of Computer Science & Information Systems: A Short History|url=http://www.dcs.bbk.ac.uk/site/assets/files/1029/50yearsofcomputing.pdf|website=Birkbeck College|publisher=University of London|access-date=23 July 2017|date=April 2008}}</ref>
* [[Manchester Baby]], a developmental, fully electronic computer that successfully ran a stored program on 21 June 1948. It was subsequently developed into the [[Manchester Mark 1]], which ran its first program in early April 1949.
* [[Electronic Delay Storage Automatic Calculator]], EDSAC, which ran its first programs on 6 May 1949, and became a full-scale operational computer that served a user community beyond its developers.
* [[EDVAC]], conceived in June 1945 in ''[[First Draft of a Report on the EDVAC]]'', but not delivered until August 1949.
* [[BINAC]], delivered to a customer on 22 August 1949. It worked at the factory but there is disagreement about whether or not it worked satisfactorily after being delivered. If it had been finished at the projected time, it would have been the first stored-program computer in the world. It was the first stored-program computer in the U.S.<ref>{{cite book |last=Hally |first=Mike |title=Electronic Brains |date=2005 |pages=40–41 |isbn=978-1862076631 |publisher=[[Granta]] |edition=First}}</ref>
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