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GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
Perl - Highly capable, feature-rich programming language with over 26 years of development
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
Gema - General purpose text macro processor.
XMLStarlet - XMLStarlet Command Line XML Toolkit
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.