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jnosql-extensions
This project contains all specialization to Eclipse JNoSQL. The specific behavior in a NoSQL database matters, that's why there are Eclipse JNoSQL Mapper specializations.
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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.
For the moment, it has been published as a MongoDB extension but, with the community approval and once it's stable enough, it will brought to the main API and will work with every other Document NoSQL databases.
NOTE:
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Hence, a higher number means a more popular project.