Top 20 NuGet concurrency Packages

Sharded actors with managed lifecycle for Akka.NET cluster
Reactive stream support for Akka.NET
Akka.NET Persistence ADO.NET middleware
Replicated data using CRDT structures
Akka.NET is a port of the popular Java/Scala framework Akka to .NET
Remote actor support for Akka.NET
Provides useful structures for performing efficient concurrent operations. Original Project: https://github.com/etishor/ConcurrencyUtilities, including a port of Java's LongAdder and Striped64 classes
Dependency injection support for Akka.NET
Persistence actor support for Akka.NET
You need a Akka.TestKit.* package! Add the one appropriate for the test framework you use instead. For example: Akka.TestKit.Xunit or Akka.TestKit.VsTest. This package only contains base functionality for writing tests for the Akka.NET framework.
NLog logging adapter for Akka.NET
Distributed publish/subscribe, client and singleton support for Akka.NET cluster
Cluster support for Akka.NET
Hyperion serializer for Akka.NET
TestKit for writing tests for Akka.NET using xUnit.
Adds a concept of thread safety to C# and VB so that most threading defects are detected at build-time or in a single-threaded test coverage. Includes a deadlock detection policy and thread dispatching aspects. An official PostSharp pattern library.
TestKit for writing tests for Akka.NET using xUnit.
Akka.NET streams support for ADO.NET Persistence middleware.
F# API support for Akka.NET
Dependency Injection (DI) TestKit support for Akka.NET