OSF

from The Free On-line Dictionary of Computing (8 July 2008)

Open Software Foundation
OSF

   <body> (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 systems} 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)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

OSF
       Open Software Foundation (HP, DEC, IBM, org.)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

OSF
       Operations System Function (IN)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

OSF
       Oppose Sun Forever [ aka Open Software Foundation] (slang, org.)