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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.
Java is a great tool to have here. You can use the AppKit to create a dApp: https://github.com/ergoplatform/ergo-appkit
Plenty of developer bounties up for grabs too.
NOTE:
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Hence, a higher number means a more popular project.