GNU sed - sed (stream editor) is a Unix utility that parses text and implements a programming language which...
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
Perl - Highly capable, feature-rich programming language with over 26 years of development
GPP - GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of...
TXR - Pragmatic, convenient data munging language.
PP - A generic Preprocessor - P is a text preprocessor designed for Pandoc (and more generally Markdown and reStructuredText).