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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.
They haven't released an official api yet, but some people have figured out the private one and how to backdoor to get full control of the lights. https://github.com/scrool/xled
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Hence, a higher number means a more popular project.