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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.
It’s also very much still a thing rebranded as Microdata. You can find examples on Schema.org, but now there are easier ways to share the same info; I prefer JSON-LD.
NOTE:
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Hence, a higher number means a more popular project.