Source : Free On-Line Dictionary of Computing

Open Software Foundation
     
         (OSF) A foundation created by nine computer vendors,
        ({Apollo}, {DEC}, {Hewlett-Packard}, {IBM}, {Bull}, {Nixdorf},
        {Philips}, {Siemens} and {Hitachi}) to promote "Open
        Computing".  It is planned that common {operating system}s and
        interfaces, based on developments of {Unix} and the {X Window
        System} will be forthcoming for a wide range of different
        hardware architectures.  OSF announced the release of the
        industry's first open {operating system} - OSF/1 on 23 October
        1990.
     
        (1994-11-23)