sma/lox is an open source project licensed under MIT License which is an OSI approved license.
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Repository for the book "Crafting Interpreters"
A tiny, still incomplete interpreter for a language similar to Python 3
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An Interpreter for a Python-like Language Written in Dart
reddit.com/r/dartlang | 2021-05-04
PS: If you really want to learn how to implement interpreters, I recommend Bob Nystrom's book Crafting Interpreters in which you learn to create a Java-like programming language from scratch using Java. Like others before me (I guess) I ported the Java source to Dart.