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InfluxDB
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There are several great RPi synth projects around, including mt32-pi, mini-dexed and samplerbox, but they're all intended for headless use (or with a tiny embedded display). The outlier in that respect AFAIK is Zynthian: https://zynthian.org/
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.