Actix is a Rust actors framework.The base of it is a powerful actor system for Rust on top of which the actix-web system was originally built. This is what you are most likely going to work with. What actix-web gives you is a fun and very fast web development framework.

Actix - Rust's powerful actor system and most fun web framework

Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more. 
It is memory efficient. Its most interesting class is <A HREF="http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/MapMaker.html" target="_blank">MapMaker</A>, which is a ConcurrentMap builder, providing any combination of these features: soft or weak keys, soft or weak values, timed expiration, and on-demand computation of values. Check out their video in <A HREF="http://www.youtube.com/watch?v=ZeO%5FJ2OcHYM" target="_blank">Youtube</A>.

Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more.

Guava - Google Core Libraries for Java

Akka is the platform for the next generation event-driven, scalable and fault-tolerant architectures on the JVM. It helps to write simpler correct concurrent applications using Actors, STM & Transactors. It could scale out on multi-core or multiple nodes using asynchronous message passing. For fault-tolerance it adopts the Let it crash or Embrace failure model to build applications that self-heals, systems that never stop.

Akka - Build Concurrent and Scalable Applications

Java Concurrency Tools for the JVM. This project aims to offer some concurrent data structures currently missing from the JDK.
 
<ul>
<li>
SPSC/MPSC/SPMC/MPMC variations for concurrent queues:
<ul>
<li>SPSC - Single Producer Single Consumer (Wait Free, bounded and unbounded)</li>
<li>MPSC - Multi Producer Single Consumer (Lock less, bounded and unbounded)</li>
<li>SPMC - Single Producer Multi Consumer (Lock less, bounded)</li>
<li>MPMC - Multi Producer Multi Consumer (Lock less, bounded)</li>
</ul>
</li>
<li>
SPSC/MPSC linked array queues offer a balance between performance, allocation and footprint
</li>
<li>
An expanded queue interface (MessagePassingQueue):
<ul>
<li>relaxedOffer/Peek/Poll: trade off conflated guarantee on full/empty queue state with improved performance.</li>
<li>drain/fill: batch read and write methods for increased throughput and reduced contention</li>
</ul>
</li>
</ul>

Java Concurrency Tools for the JVM. This project aims to offer some concurrent data structures currently missing from the JDK.

JCTools - Java Concurrency Tools for the JVM

ZIO is a zero-dependency Scala library for asynchronous and concurrent programming. It is powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.
 
<ul>
<li>High-performance. Build scalable applications with 100x the performance of Scala's <code>Future</code>.</li>
<li>Type-safe. Use the full power of the Scala compiler to catch bugs at compile time.</li>
<li>Concurrent. Easily build concurrent apps without deadlocks, race conditions, or complexity.</li>
<li>Asynchronous. Write sequential code that looks the same whether it's asynchronous or synchronous.</li>
<li>Resource-safe. Build apps that never leak resources (including threads!), even when they fail.</li>
<li>Testable. Inject test services into your app for fast, deterministic, and type-safe testing.</li>
<li>Resilient. Build apps that never lose errors, and which respond to failure locally and flexibly.</li>
<li>Functional. Rapidly compose solutions to complex problems from simple building blocks.</li>
</ul>

ZIO is a zero-dependency Scala library for asynchronous and concurrent programming. It is powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.

Zio - A type-safe, composable library for async and concurrent programming in Scala 

Gpars is a framework which provides straightforward Java or Groovy-based APIs to declare, which parts of the code should be performed in parallel. Collections can have their elements processed concurrently, closures can be turned into composable asynchronous functions and run in the background on your behalf, mutable data can be protected by agents or software transactional memory. GPars helps to create several independent Actors, which consume messages passed to them and communicate with other actors by sending them messages.

Gpars is a framework which provides straightforward Java or Groovy-based APIs to declare, which parts of the code should be performed in parallel. Collections can have their elements processed concurrently, closures can be turned into composable asynchronous functions and run in the background on your behalf, mutable data can be protected by agents or software transactional memory.

Gpars - Groovy parallel systems

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Actix - Rust's powerful actor system and most fun web framework

Guava - Google Core Libraries for Java

Akka - Build Concurrent and Scalable Applications

JCTools - Java Concurrency Tools for the JVM

Zio - A type-safe, composable library for async and concurrent programming in Scala

Gpars - Groovy parallel systems

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Actix - Rust's powerful actor system and most fun web framework

Guava - Google Core Libraries for Java

Akka - Build Concurrent and Scalable Applications

JCTools - Java Concurrency Tools for the JVM

Zio - A type-safe, composable library for async and concurrent programming in Scala

Gpars - Groovy parallel systems

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