TXR - Pragmatic, convenient data munging language.
GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
SNR (Search-n-Replace) - SNR is a free Windows command-line utility that performs multiple string-replacement operations on a data file in a single pass.
XMLStarlet - XMLStarlet Command Line XML Toolkit
Perl - Highly capable, feature-rich programming language with over 26 years of development
xmllint - command line XML tool