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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.
The tutorials I'm looking at point to https://github.com/gnea/grbl/ as the source for GRBL, but that doesn't appear to have been developed for some months now and PR's are not being merged which is usually the sign of an unmaintained repo.
grblHAL runs on a pico. Check out the PicoBOB as an open source solution to work with the common “Mach3” parallel port break out boards.
NOTE:
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Hence, a higher number means a more popular project.