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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.
Dgraph is a highly scalable hyper fast graph database that is distributed, and is built on top of Badger. For consensus, it Raft protocol. (Git repo https://github.com/dgraph-io/dgraph)
Badger is very fast K/V store. Many projects use badger including the tracing tool Jaeger. However, distribution would be something you'd have to build outside of Badger, as that is beyond its scope. (git repo: https://github.com/dgraph-io/badger)
NOTE:
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Hence, a higher number means a more popular project.