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gcodepreview
OpenSCAD library for moving a tool in lines and arcs so as to model how a part would be cut using G-Code.
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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.
For G-code note that mostly these days it's made using CAM applications. A further consideration is that hobbyist firmwares usually forgo variables and loops and branching (but see: https://github.com/NRSoft/GSharp --- I believe that's integrated into bCNC).
NOTE:
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Hence, a higher number means a more popular project.