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

VisualWorks

    A modern commercial implementation of the
   Smalltalk programming language.  VisualWorks descends
   directly from the original Smalltalk-80 by Xerox PARC and
   was originally developed (for some time under the name
   Objectworks\Smalltalk) by ParcPlace Systems.  VisualWorks
   relies on dynamic translation as its virtual machine
   technology.

   VisualWorks Wiki (http://wiki.cs.uiuc.edu/VisualWorks).

   (2003-05-15)