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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.
They aren't ripping of without giving back. You can go to GitHub rn and download all files for the Ender 3 and CR-10 etc licensed with GPL3. That is also the reason you find, that pretty much every budget printer looks like a Ender 3 these days. Creality really isn't a company that only takes, they also give back to the community.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.