The Free On-line Dictionary of Computing (30 December 2018):

Icon-Based Parser Generation System 2
Ibpag2

    (Ibpag2) A parser generator for Icon by Richard
   L. Goerwitz .  It can handle both
   SLR1 grammars and even GLR grammars (Tomita grammars).
   Ibpag2 runs under Unix.

   (2004-06-06)