Recursive Macro Actuated Generator
A stand-alone macroprocessor for IBM 360/370 under VS or OS. Many built-in features and a library of several hundred macros. Several large systems were written in RMAG to generate source code for languages such as IBM JCL, IBM assembly language, COBOL.
There was also a system (SLANG: Structured LANGuage compiler) which would generate 370 assembly language from a pseudo-structured-programming language, based on Michael Kessler's structure programming macros developed at IBM.