structures
21.SparseBitSet79 usages
com.zaxxer » SparseBitSet Apache
An efficient sparse bitset implementation for Java
Last Release on Sep 6, 2023
Persistent collections based on 2-3 finger trees.
Last Release on Dec 31, 2025
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.Disruptor25 usages
com.conversantmedia » disruptor Apache
Conversant Disruptor - very high throughput Java BlockingQueue
Last Release on Oct 18, 2022
26.Typonym Core3 usages
dev.soundness » typonym-core Apache
Collections raised to the type-level in Scala
Last Release on Jul 7, 2026
Immutable Collections
Last Release on Oct 3, 2023
28.Integers3 usages
com.almworks.integers » integers Apache
Efficient Java collections for primitive integer types
Last Release on Apr 16, 2025
29.GNU Trove891 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
30.ConcurrentLinkedHashMap282 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