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InfluxDB
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Winterbloom also has something similar with their interactive user guide for Castor & Pollux (their latest Eurorack-format synth module). It's geared towards beginners and explains a lot of things that are useful even if you don't ever plan to get that module or any modular gear at all.
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.