Source : Free On-Line Dictionary of Computing

Cogent Prolog
     
         A full {Edinburgh standard Prolog} with {debugger},
        {listener}, {DCG}, many {built-ins}, text windows, support for
        {modules}, and support for both 16-bit and 32-bit {protected
        mode}.
     
        Contact: Dennis C. Merritt.
     
        (1999-11-24)