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GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
XMLStarlet - XMLStarlet Command Line XML Toolkit
Gema - General purpose text macro processor.
xmllint - command line XML tool
GPP - GPP is a general-purpose preprocessor with customizable syntax, suitable for a wide range of...
Bracmat - Programming language for symbolic computation with extraordinary combination of pattern matching...