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

Schoonschip

    (From the Dutch for "beautiful ship" or
   "clean ship") A program for symbolic mathematics, especially
   High Energy Physics, written by M. Veltman of CERN in 1964.
   Schoonschip only does algebra, no derivatives.  It was
   implemented originally in CDC 6600 and CDC 7600 assembly
   language and currently in 680x0 assembly language.  Runs
   on Amiga, Atari ST, Sun-3 and NeXT.

   It was once maintained by David Williams at the University of
   Michigan Physics Department.

   (ftp://archive.umich.edu/physics/schip).

   (2000-11-14)