Collections
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Types that extend and augment the Java Collections Framework.
Last Release on Nov 12, 2015

The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.
Last Release on Apr 19, 2025
This library makes some new Scala APIs (mainly collections) available to older versions of Scala.
Last Release on Oct 7, 2025
fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. Note that if you have both this jar and fastutil-core.jar in your dependencies, fastutil-core.jar should be excluded.
Last Release on Oct 5, 2025
The API module of Eclipse Collections, offering rich and efficient data structures for Java.
Last Release on Jun 23, 2025
feature-rich collections framework for Java, offering alternatives to standard Java Collections.
Last Release on Jun 23, 2025
The Trove library provides high speed regular and primitive collections for Java.
Last Release on Dec 4, 2014

Relocated → net.sf.trove4j » core
Standalone efficient collections.
Last Release on Mar 12, 2025
Standalone efficient collections.
Last Release on Sep 21, 2018

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