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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.
"The spirit" being to go to https://openjdk.org/ and look around. Take a look at project Loom (improving concurrency) or project Valhalla (improving the type system). Clone the repo at https://github.com/openjdk/jdk and try to build it locally. Then try make small experimental changes to get used to the code base. Then read the Github issue lists and see if you can fix some of them. Subscribe to and hang out on the mailing lists.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.