Hello, World program: SNOBOL4 & SPITBOL
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.
SNOBOL Language Web Page: Introduction to SNOBOL Programming Language.
SNOBOL4 and SPITBOL Information: Catspaw Inc's SNOBOL site.
SNOBOL4 Resources: Information and links about SNOBOL4.
SNOBOL4+ user notes: Information for people having documentation for the Vanilla SNOBOL programming language and wishing to use SNOBOL4+. By Michael Davis.