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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.
By this point, mostly. Some things still require new protocol extensions, e.g. global hotkeys.
I have not tried it myself but https://github.com/waycrate/swhkd exists
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Hence, a higher number means a more popular project.