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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Gnat
      <language, tool> An Ada compiler written in Ada using
      the gcc code generator to allow easy porting to a
      variety of platforms.  Gnat is the only Ada compiler that
      completely implements the Ada standard, including all the
      annexes.
      The compiler is released under the GNU license and is
      currently maintained by Ada Core Technologies (ACT).
      (http://gnat.com/).
      (1999-06-24)