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InfluxDB
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This one https://github.com/IanWraith/24DownConvert is the most promising approach, will start a new thread specifically looking for feedback on using a mixer and a programmable oscillator (adding an LCD, would result in a tunable downconverter)
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.