The website www.computer50.org tells the story in depth of the building of the world’s first stored-program computer (the “Baby”) at The University of Manchester in 1948 by Professor F.C. Williams and Tom Kilburn, and of the two computers that evolved directly from it, the Manchester Mark 1 (1949) and the commercially manufactured Ferranti Mark 1 (February, 1951). The story is placed in the context of the world computing scene at that time. The website contains transcriptions of many important papers and documents. It also gives an account of the 50th Anniversary celebrations, for which the website was created in 1998.