GPP - GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of...
GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
Filepp - filepp is a generic file preprocessor.
Gema - General purpose text macro processor.
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
XMLStarlet - XMLStarlet Command Line XML Toolkit