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

Standard ML of New Jersey
SML/NJ

   (SML/NJ) An implementation of SML by Andrew Appel at
   Princeton  and Dave MacQueen at
   AT&T.  Version 0.93.

   ["Standard ML of New Jersey", A. Appel et al, "Proc Third Intl
   Symp on Prog Lang Impl and Logic Programming", LNCS Springer
   1991].

   Versions for Unix, Mac.  (ftp://cs.yale.edu/pub/ml),
   (ftp://research.att.com/dist/ml).  Mailing list:
   sml@cs.cmu.edu.