Top 20 NuGet concurrency Packages

Ultra-fast distributed actors for .NET.
Cross-platform library providing exclusive lock on file.
Ultra-fast distributed actors for .NET.
Akka.NET Persistence journal and snapshot store backed by Oracle ODP.NET
Akka.NET Persistence read journal backed by EventStore.
Ultra-fast distributed actors for .NET.
A concurrency and state library for .NET, shines in net call services.
Ultra-fast distributed actors for .NET.
An easy to use, simple yet feature-rich open-source framework for writing middlewares in the form of low resource footnote Windows services, Linux Daemons or containerized microservices. Takes care of multi-threaded service granular scheduling, shutdowns, restarts, error recovery.
Dependency injection extension for Com.H.Threading.Scheduler API to facilitate easier usage for applications that utilize IHostBuilder services DI pipeline
InSync is a general purpose library providing easy ways to correctly write thread-safe code for .NET.
A High Performance Inter-Thread Messaging Library
Microsoft Concurrency Visualizer for .NET Standard, .NET Core and .NET Framework (Microsoft.ConcurrencyVisualizer.Markers.dll/Microsoft.ConcurrencyVisualizer.Instrumentation SDK Tools). - Document: https://weblogs.asp.net/dixin/port-microsoft-concurrency-visualizer-sdk-to-net-standard-and-n...
Additonal FluentAssertions for multithreaded tests
Useful set of collections, and extensions for collections with thread-safe read-write access options. Part of the "Open" set of libraries.
A set of async versions of common concurrency primitives.
The Hopac.Extras project contains useful abstractions implemented with Hopac.
Provides opt-in support for concurrency controls on Rebus message handling. This includes single access sagas (ie. only ony handler for a given saga running at a time) as well as more general handler throttling (ie. Throttling message through put based on types or properties)
CB.System is a collection of common classes to solve frequently occurring challenges according to System.*.
ParallelHelper is a static code analyzer that helps to identify concurrency related issues. Moreover, it provides hints to improve the robustness of code with concurrency in mind.