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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.
Failing that, looks like Bref will be the option in place of Vapor.
You might be interested in the newly released Hover tool that is basically "Vapor but you run it on your computer"-type tool: https://github.com/themsaid/hover
NOTE:
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Hence, a higher number means a more popular project.