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nand2tetris
An implementation of the nand2tetris project. A full-stack computer: ISA, Assembler, Virtual Machine, Interpreter, Compiler, Operating System, and a Graphical Sudoku game. All from scratch. (by porridgewithraisins)
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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.
It sounds you are asking about CS fundamentals. I recommend https://www.nand2tetris.org/
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