structures
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21.Finger Tree13 usages

org.clojure » data.finger-tree EPL

Persistent collections based on 2-3 finger trees.
Last Release on Dec 31, 2025

22.Google Collections Bundle113 usages

com.atlassian.bundles » google-collections Apache

Google Collections with OSGi manifest entries
Last Release on Sep 24, 2024

Relocated → com.google.guava » guava

23.Trove (core)127 usages

net.sf.trove4j » core LGPL

High performance collections for Java
Last Release on Aug 3, 2018

24.Shims26 usages

org.roaringbitmap » shims Apache

Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.
Last Release on Sep 12, 2023

25.Typonym Core3 usages

dev.soundness » typonym-core Apache

Collections raised to the type-level in Scala
Last Release on Jul 7, 2026

26.Jcabi Immutable18 usages

com.jcabi » jcabi-immutable BSD

Immutable Collections
Last Release on Oct 3, 2023

27.Integers3 usages

com.almworks.integers » integers Apache

Efficient Java collections for primitive integer types
Last Release on Apr 16, 2025

28.GNU Trove893 usages

net.sf.trove4j » trove4j LGPL

The Trove library provides high speed regular and primitive collections for Java.
Last Release on Dec 4, 2014

Relocated → net.sf.trove4j » core

29.ConcurrentLinkedHashMap287 usages

com.googlecode.concurrentlinkedhashmap » concurrentlinkedhashmap-lru Apache

A high performance version of java.util.LinkedHashMap for use as a software cache.
Last Release on Jan 28, 2015

30.Disruptor25 usages

com.conversantmedia » disruptor Apache

Conversant Disruptor - very high throughput Java BlockingQueue
Last Release on Oct 18, 2022