The Free On-line Dictionary of Computing (19 January 2023):

SCM

   1.  Supply Chain Management.

   (2003-10-09)

   2.  A Scheme interpreter in C by Aubrey Jaffer
   and others.  SCM conforms to R4RS and IEEE P1178 and
   includes a conformance test.  It is distributed under GPL.
   Version 5d0 runs under Amiga, Atari-ST, MacOS, MS-DOS,
   OS/2, NOS/VE, Unicos, VMS, Unix, and similar
   systems.

   x-scm provides an X Window System interface for SCM
   programs.

   (http://swissnet.ai.mit.edu/~jaffer/SCM.html).

   (1999-06-07)