DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   SUMMER
      String manipulation and pattern matching language by Klint &
      Sint at CWI in the late 1970s.  It was recently used as the
      input and implementation language for the Dataflow Compiler
    Project at CWI.
      ["An Overview of the SUMMER Programming Language", Paul Klint,
      7th POPL, ACM 1980, pp. 47-55].