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InfluxDB
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While the webpage is beneficial, you're talking about two different things. The 1) control of printer settings and 2) Firmware. With the Duet they publish the firmware and you upload it. However, much like SKR (Marlin); You can download the latest firmware and or modify and compile it yourself.
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.