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Smalltalk
Parser, code model, interpreter and navigable browser for the original Xerox Smalltalk-80 v2 sources and virtual image file (by rochus-keller)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
When I was googling the link for that book, I noticed an implementation someone else has done that might be helpful for you if you go this route: dbanay/Smalltalk.
Here is one even in Lua: https://github.com/rochus-keller/Smalltalk/
NOTE:
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Hence, a higher number means a more popular project.