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Mathics3
https://github.com/Mathics3/Mathics3-scanner
GitHub - Mathics3/Mathics3-scanner: Tokenizer, and operator and character tables, and conversion...
Tokenizer, and operator and character tables, and conversion routines for the Wolfram Language. - Mathics3/Mathics3-scanner
and operatorgithubscannertokenizercharacter