Top 20 NuGet async Packages

ReactiveProperty is MVVM and Asynchronous Extensions for Reactive Extensions(System.Reactive). Target is .NET 4.6, UWP ,Xamarin(Android, iOS, Forms) and .NET Standard 1.3.
Azure Storage Extensions is a .NET library aimed for managing and querying entities from Microsoft Azure Storage. It's built on top of Azure Storage Client Library, provides LINQ to Azure Tables queries and async interfaces.
Async-friendly format for stack traces and exceptions
A truly async MySQL ADO.NET provider, supporting MySQL Server, MariaDB, Percona Server, Amazon Aurora, Azure Database for MySQL and more.
A fluent, portable, testable HTTP client library.
Asynchronous sink wrapper for Serilog.
Redis client library based on StackExchange.Redis with features like an extensible serialization strategy, a tagging mechanism to group keys and hash fields, and more, all being cluster-compatible.
High performance Redis client, incorporating both synchronous and asynchronous usage.
StackExchange.Redis.Extensions is a library that extends StackExchange.Redis allowing you a set of functionality needed by common applications. To store complex data It requires one of the following implementations: - StackExchange.Redis.Extensions.Newtonsoft - StackExchange.Redis.Extensions.Jil -...
StackExchange.Redis.Extensions is a library that extends StackExchange.Redis allowing you a set of functionality needed by common applications. This implementation is based on Newtonsoft Json.Net serializer.
Provides easy-to-use and robust fully distributed locks (using SQLServer) as well as wrappers for named system-wide locks (using WaitHandles)
High performance Redis client, incorporating both synchronous and asynchronous usage.
Simple C# Promises Library
SQLite-Net Extensions is a very simple ORM that provides cascade operations, one-to-one, one-to-many, many-to-one, many-to-many, inverse and text-blobbed relationships on top of the sqlite-net library.
Asynchronous sequences for F#
This is the Flurl.Http package, repackaged with strongly named assemblies. See http://tmenier.github.io/Flurl for the official project.
A helper library for the Task-Based Asynchronous Pattern (TAP).
A developer friendly service bus for .NET
Inspired by languages like Concurrent ML and Cilk, Hopac is a library for F# with the aim of making it easier to write efficient parallel, asynchronous, concurrent and reactive programs. Hopac is licensed under a MIT-style license. See project website for further information.
Provides useful helpers regarding threading