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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.
Last Release on Jul 9, 2019
Types that extend and augment the Java Collections Framework.
Last Release on Nov 12, 2015

Java implementation of a concurrent trie hash map from Scala collections library
Last Release on Sep 18, 2014
A Java 8 collections helper library. Whenever possible, it tries to be API-compatible to Google Guava.
Last Release on Nov 21, 2016
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
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
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 Feb 7, 2024
Conversant Disruptor - very high throughput Java BlockingQueue
Last Release on Oct 18, 2022
A Java 8 collections helper library. Whenever possible, it tries to be API-compatible to Google Guava.
Last Release on Mar 31, 2016