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Standalone efficient collections.
Last Release on Mar 11, 2026
scala-parallel-collections
Last Release on Jan 7, 2025
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.
Last Release on Jan 10, 2024
A Persistent Java Collections Library
Last Release on Jul 23, 2025
Types that extend and augment the Java Collections Framework.
Last Release on Nov 12, 2015

Utility library for collections, comparators and iterator classes
Last Release on Aug 25, 2026
Simple tools for working with data streams in LazyLists in Scala
Last Release on Jul 7, 2026
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 ...
Last Release on Aug 13, 2026
Google Collections with OSGi manifest entries
Last Release on Sep 24, 2024

Relocated → com.google.guava » guava
The bit array data structure is implemented in Java as the BitSet class. Unfortunately, this fails to scale without compression.
Last Release on Mar 9, 2023