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Google Collections Library is a suite of new collections and collection-related goodness for Java 5.0
Last Release on Jun 5, 2008
Utility library for collections, comparators and iterator classes
Last Release on Jul 20, 2018
Java implementation of a concurrent trie hash map from Scala collections library
Last Release on Sep 18, 2014
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. The iteration protocol was inspired by the Smalltalk collection framework.
Last Release on Mar 14, 2016
Last Release on Dec 4, 2014
Primitive-type collections based on CERN's Colt Java API
Last Release on Apr 12, 2010
Efficient collections for sets and maps that has primitive types as keys.
Last Release on Aug 31, 2018
Persistent collections based on 2-3 finger trees.
Last Release on Apr 5, 2014
This library provides efficient implementations for various collection data structures (esp. linked lists and priority queues), which have very insufficient implementation in the Java Collections Foundations that makes it hard or even impossible to exploit their efficiencies.
Last Release on May 11, 2018
OPS4J Base - Utilities/Extensions related to java collections.
Last Release on Sep 19, 2014