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...
GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
GPP - GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of...
TXR - Pragmatic, convenient data munging language.