GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
xmllint - command line XML tool
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Filepp - filepp is a generic file preprocessor.
GNU sed - sed (stream editor) is a Unix utility that parses text and implements a programming language which...