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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
Eclipse Collections API
Last Release on Sep 20, 2017
Utility library for collections, comparators and iterator classes
Last Release on Oct 2, 2017
Java implementation of a concurrent trie hash map from Scala collections library
Last Release on Sep 18, 2014
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 Nov 13, 2017
Persistent collections based on 2-3 finger trees.
Last Release on Apr 5, 2014
OPS4J Base - Utilities/Extensions related to java collections.
Last Release on Sep 19, 2014
Jcommon Collections Package
Last Release on Nov 3, 2017