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.

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