Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache. Its features include: 
 <UL>
	<LI>Fast and Light Weight</LI>
	<LI>Scalable to hundreds of caches</LI>
	<LI>Multiple CacheManagers per virtual machine</LI>
	<LI>Distributed Caching</LI>
	<LI>Provides LRU, LFU and FIFO cache eviction policies</LI>
	<LI>Supports Object or Serializable caching</LI>
	<LI>Full implementation of JSR107 JCACHE API</LI>
	<LI>Extensible</LI>
	<LI>Persistence, Flush to disk on demand</LI>
	<LI>Supports as standalone server, SOAP cache server, RESTful cache server</LI>
	<LI>Works with Hibernate, Google App Engine </LI>
 </UL>

Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

Ehcache

Caffeine is a high performance, near optimal caching library based on Java 8. It provides an in-memory cache using a Google Guava inspired API.
 
<ul>
<li><a href="https://github.com/ben-manes/caffeine/wiki/Population">automatic loading of entries</a> into the cache, optionally asynchronously</li>
<li><a href="https://github.com/ben-manes/caffeine/wiki/Eviction#size-based">size-based eviction</a> when a maximum is exceeded based on <a href="https://github.com/ben-manes/caffeine/wiki/Efficiency">frequency and recency</a></li>
<li><a href="https://github.com/ben-manes/caffeine/wiki/Eviction#time-based">time-based expiration</a> of entries, measured since last access or last write</li>
<li><a href="https://github.com/ben-manes/caffeine/wiki/Refresh">asynchronously refresh</a> when the first stale request for an entry occurs</li>
<li>keys automatically wrapped in <a href="https://github.com/ben-manes/caffeine/wiki/Eviction#reference-based">weak references</a></li>
<li>values automatically wrapped in <a href="https://github.com/ben-manes/caffeine/wiki/Eviction#reference-based">weak or soft references</a></li>
<li><a href="https://github.com/ben-manes/caffeine/wiki/Removal">notification</a> of evicted (or otherwise removed) entries</li>
<li><a href="https://github.com/ben-manes/caffeine/wiki/Writer">writes propagated</a> to an external resource</li>
<li>accumulation of cache access <a href="https://github.com/ben-manes/caffeine/wiki/Statistics">statistics</a></li>
</ul>

Caffeine is a high performance, near optimal caching library based on Java 8. It provides an in-memory cache using a Google Guava inspired API.

Caffeine -  A high performance caching library for Java 8

Chronicle Map is a high performance, off-heap, key-value, in memory, persisted data store. It works like a  standard java map yet it automatically distributes data between processes, these processes can be both on the same server or across your network. In other words its a low latency, huge data key value store, which can store terabytes of data locally to your process.

Chronicle Map - High performance, off-heap, key-value, in memory, persisted data store

Coherence CE (Community Edition) is a free and open source edition of Oracle Coherence, first and market-leading in-memory data grid. It has been used by hundreds of customers across many industries to power some of the mission critical systems you use every day. Coherence clusters can easily scale to hundreds of members (JVMs), all of which can both store and process the data. It can optionally persist data to disk (either local or shared), which prevents data loss even in the case of complete cluster outage.
 
Coherence is fast. Like, sub-millisecond fast. Each member of the cluster is aware of where each piece of data resides and can access it using a single network call. There are no connections to acquire or release, and no distributed transactions to commit or roll back.

Coherence CE (Community Edition) is a free and open source edition of Oracle Coherence, first and market-leading in-memory data grid. It has been used by hundreds of customers across many industries to power some of the mission critical systems you use every day. Coherence clusters can easily scale to hundreds of members (JVMs), all of which can both store and process the data. It can optionally persist data to disk (either local or shared), which prevents data loss even in the case of complete cluster outage.

Coherence CE (Community Edition) is a free and open source edition of Oracle Coherence, first and market-leading in-memory data grid

cache2k focuses on providing a well engineered in-memory object cache implementation for Java applications. It has fastest access times, due to non blocking and wait free access of cached values. It is thread safe, with a complete set of atomic operations. It supports automatic expiry and refresh: duration or point in time, variable expiry per entry, delta calculations.

Cache2k –  Lightweight, high performance Java caching 

Cacheonix is an Open Source Java cache that allows developers to scale applications horizontally by providing a highly concurrent local cache and a strictly consistent distributed cache. It supports Distributed cache, Web application cache, Distributed lock, Second level (L2) cache. 

Cacheonix - Open Source Java Cache

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Caffeine - A high performance caching library for Java 8

Chronicle Map - High performance, off-heap, key-value, in memory, persisted data store

Coherence CE (Community Edition) is a free and open source edition of Oracle Coherence, first and market-leading in-memory data grid

Cache2k – Lightweight, high performance Java caching

Cacheonix - Open Source Java Cache

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Caffeine - A high performance caching library for Java 8

Chronicle Map - High performance, off-heap, key-value, in memory, persisted data store

Coherence CE (Community Edition) is a free and open source edition of Oracle Coherence, first and market-leading in-memory data grid

Cache2k – Lightweight, high performance Java caching

Cacheonix - Open Source Java Cache

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