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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.
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llvm-project
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
I cannot recommend Crafting Interpreters by Robert Nystrom enough, it covers a lot of the stuff you need to know, completely for free.
You can do even simpler like https://stopa.io/post/222 and if wanna other langs exist https://github.com/kanaka/mal
If you want to make a compiled language and you use C/C++, use LLVM.
Here's my own Lisp, in my language. I wonder how many of us have done this.
NOTE:
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Hence, a higher number means a more popular project.