1950s
- 1951
- LEO I 'Lyons Electronic Office' was the commercial development of EDSAC computing platform, supported by British firm J. Lyons and Co.
- 1954
- MIT's Tape Director operating system made for UNIVAC 1103
- 1955
- General Motors Operating System made for IBM 701
- 1956
- GM-NAA I/O for IBM 704, based on General Motors Operating System
- 1957
- Atlas Supervisor (Manchester University) (Atlas computer project start)
- BESYS (Bell Labs), for IBM 7090 and IBM 7094
- 1958
- University of Michigan Executive System (UMES), for IBM 704, 709, and 7090
- 1959
- SHARE Operating System (SOS), based on GM-NAA I/O
Read more about this topic: Timeline Of Operating Systems