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GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
Gema - General purpose text macro processor.
XMLStarlet - XMLStarlet Command Line XML Toolkit
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
xmllint - command line XML tool
PP - A generic Preprocessor - P is a text preprocessor designed for Pandoc (and more generally Markdown and reStructuredText).