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staticrypt
Password protect a static HTML page, decrypted in-browser in JS with no dependency. No server logic needed.
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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.
https://github.com/robinmoisson/staticrypt -- not tried it, but it looks ideal for what the OP was asking for
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.