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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.
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Gema - General purpose text macro processor.
GNU M4 - GNU M4 is an implementation of the m4 macro preprocessor.
Ruby - A dynamic, interpreted, open source programming language with a focus on simplicity and productivity