Collections
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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
Types that extend and augment the Java Collections Framework.
Last Release on Nov 12, 2015

The bit array data structure is implemented in Java as the BitSet class. Unfortunately, this fails to scale without compression.
Last Release on Mar 9, 2023
An efficient sparse bitset implementation for Java
Last Release on Sep 6, 2023
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
Conversant Disruptor - very high throughput Java BlockingQueue
Last Release on Oct 18, 2022
The Trove library provides high speed regular and primitive collections for Java.
Last Release on Dec 4, 2014

Relocated → net.sf.trove4j » core
A high performance version of java.util.LinkedHashMap for use as a software cache.
Last Release on Jan 28, 2015
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
Highly Scalable Java
Last Release on Nov 28, 2011