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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.
RavenDB is an open-source document-oriented database. It is fully ACID. It is cross-platform, supported on Windows, Linux, and Mac OS. Also, as platform as a service, it is served as cloud service as well.
NOTE:
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Hence, a higher number means a more popular project.