V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

GCT
       Group Completion Table (Power4, IBM, CPU)


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

GCT

    A test-coverage tool by Brian Marick
   , based on GNU C.  Version 1.4 was
   ported to Sun-3, Sun-4, RS/6000, 68000, 88000,
   HP-PA, IBM 3090, Ultrix, Convex, SCO but not
   Linux, Solaris, or Microsoft Windows.

   Commercial support is available from the author (+1 217 351
   7228).

   (ftp://cs.uiuc.edu/pub/testing/gct.file/).

   (1999-07-08)