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Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.

scala-parallel-collections

MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap memory. It is a fast, scalable and easy to use embedded Java database.

A Persistent Java Collections Library

Types that extend and augment the Java Collections Framework.

Utility library for collections, comparators and iterator classes

Simple tools for working with data streams in LazyLists in Scala

This artifact provides efficient implementations for various collection data structures (esp. linked lists and priority queues), which have very insufficient implementation in the Java Collections Framework that makes it hard or even ...

The bit array data structure is implemented in Java as the BitSet class. Unfortunately, this fails to scale without compression.

An efficient sparse bitset implementation for Java