GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
XMLStarlet - XMLStarlet Command Line XML Toolkit
GPP - GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of...
xmllint - command line XML tool
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
Bracmat - Programming language for symbolic computation with extraordinary combination of pattern matching...