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Gema - General purpose text macro processor.
GPP - GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of...
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
XMLStarlet - XMLStarlet Command Line XML Toolkit
PP - A generic Preprocessor - P is a text preprocessor designed for Pandoc (and more generally Markdown and reStructuredText).
Filepp - filepp is a generic file preprocessor.