Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API, additional types not found in the JDK like Bags, Multimaps, 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. It maximizes the power of Java 8 Lambda expressions and method references with rich APIs directly available on your collections. 

Eclipse Collections - Best Java Collection Framework 

Agrona provides a library of data structures and utility methods that are a common need when building high-performance applications in Java and C++. It supports Buffers, Map, Sets, Cache, Queues and lot more.
<ul>
<li>Buffers - Thread safe direct and atomic for working with on and off heap memory with memory ordering semantics.</li>
<li>Lists - Array backed lists of int/long primitives to avoid boxing.</li>
<li>Maps - Open addressing and linear probing with int/long primitive keys to object reference values.</li>
<li>Maps - Open addressing and linear probing with int/long primitive keys to int/long values.</li>
<li>Sets - Open addressing and linear probing for int/long primitives and object references.</li>
<li>Cache - Set Associative with int/long primitive keys to object reference values.</li>
<li>Clocks - Clock implementations to abstract system clocks, allow caching, and enable testing.</li>
<li>Queues - Lock-less implementations for low-latency applications.</li>
<li>Ring/Broadcast Buffers - implemented off-heap for IPC communication.</li>
<li>Basic Agent framework.</li>
<li>Signal handling to support "Ctrl + c" in a server application.</li>
<li>Scalable Timer Wheel.</li>
<li>Basic code generation from annotated implementations that can vary on primitive types.</li>
<li>Off-heap counters implementation for application telemetry and position tracking.</li>
<li>Implementations of InputStream and OutputStream that can wrap direct buffers.</li>
<li>DistinctErrorLog: A log of distinct errors to avoid filling disks with existing logging approaches.</li>
</ul>

Agrona provides a library of data structures and utility methods that are a common need when building high-performance applications in Java and C++. It supports Buffers, Map, Sets, Cache, Queues and lot more.

Agrona - Library to build high-performance applications in Java and C++

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Eclipse Collections - Best Java Collection Framework

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