GPP - GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of...
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
Gema - General purpose text macro processor.
XMLStarlet - XMLStarlet Command Line XML Toolkit
PP - A generic Preprocessor - P is a text preprocessor designed for Pandoc (and more generally Markdown and reStructuredText).
GNU sed - sed (stream editor) is a Unix utility that parses text and implements a programming language which...