Collections
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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
An efficient sparse bitset implementation for Java
Last Release on Sep 6, 2023
The Trove library provides high speed regular and primitive collections for Java.
Last Release on Dec 4, 2014

Relocated → net.sf.trove4j » core
A high performance version of java.util.LinkedHashMap for use as a software cache.
Last Release on Jan 28, 2015
Google Collections Library is a suite of new collections and collection-related goodness for Java 5.0
Last Release on Dec 30, 2009

Relocated → com.google.guava » guava
Larvalabs Collections
Last Release on Feb 12, 2007
Colt
Last Release on Oct 20, 2010

Relocated → com.blazegraph » colt
Guava Collections is a collections extension library with expanded collection types, implementations, and utility methods for dealing with aggregate data.
Last Release on Apr 26, 2010

Relocated → com.google.guava » guava
GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings.
Last Release on Mar 14, 2016

Collections library of the Staccato-Commons project, focused on providing new abstractions that mix object oriented and functional programming style for dealing with iterable objects.
Last Release on Jan 2, 2012