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Eclipse Collections
Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.
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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.
You were a little wrong, surely you can see that? And for Collections that don't autobox, you want to use something like https://github.com/eclipse/eclipse-collections
NOTE:
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Hence, a higher number means a more popular project.