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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.
I found something called Mobirise which seems to tick all my boxes. It definitely runs offline (it's a Windows executable and I disabled wi-fi to confirm) and exports my site locally as HTML as well as publishing direct to my domain, so that's good. It looks okay so far and hasn't been too hard for me to deal with. I'll stick with this for now, I think.
NOTE:
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Hence, a higher number means a more popular project.