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grbl-Mega-5X
5/6 Axis version of Grbl, the open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on an Arduino Mega2560
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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.
If you use Arduino Mega, you could control up to 6 axis as i know: https://github.com/fra589/grbl-Mega-5X
NOTE:
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Hence, a higher number means a more popular project.