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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/EliverLara/Sweet-kde I believe it's this one.
The author of that theme also does "sweet-mars' which is another take on the same general theme. The OP earlier mentioned that is what is being used (and one I've fallen in love with as well.) EliverLara also does the "candy-icons" set: https://github.com/EliverLara/candy-icons
NOTE:
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Hence, a higher number means a more popular project.