Macro Implementation of SNOBOL4 in C
   A port of Macro SNOBOL4 (The original Bell Telephone Labs implementation, written in SIL macros) for machines with 32-bit (or larger) pointers. Supports full SNOBOL4 language plus SPITBOL and other extensions.
   http://www.snobol4.org/csnobol4/

SNOBOL Language Web Page
   Introduction to SNOBOL Programming Language.
   http://cs.fit.edu/~dclay/cse5040/snobol.html

SNOBOL4 Resources
   Information and links about SNOBOL4.
   http://www.snobol4.org/

SNOBOL4 and SPITBOL Information
   Catspaw Inc's SNOBOL site.
   http://www.snobol4.com/

SNOBOL4+ user notes
   Information for people having documentation for the Vanilla SNOBOL programming language and wishing to use SNOBOL4+. By Michael Davis.
   http://www.sachsdavis.clara.net/Snobol4Pdoc.html