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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.
There is a project called insporation*, which is the side-side-project from one of the core team members and he is joined by another core team member there. This is not (yet?) an "official" or even feature-complete app, but it's based 100% on the API and will continue to be improved. You might want to follow this project, and give it a try! :)
NOTE:
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Hence, a higher number means a more popular project.