Top 20 NuGet middleware Packages

Monitoring middleware implementation based on OWIN interface defined in Microsoft.Owin NuGet.
Middleware for implementing monitoring endpoints in ASP.NET Web Api.
FuzzySerializer integration to .Net Framework
Add Alexa.NET.Security to your ASP.NET Core 2.0 request pipeline to validate requests from the Amazon Alexa services.
Stub Data Generator Middleware for Asp.Net core
ASP.NET Core Middleware
Polly plugin for ESI.NET
Interface definitions to support plug and play between OWIN Framework authorization packages
Easy to use ASP.NET Core middleware for restricting access to JavaScript and CSS source map (.map) files.
HarakaMQ Client is a reliable high performance message subscriber/publisher for a HarakaMQ Broker.
Middleware for logging requests and errors in ASP.NET core applications.
Based on prometheus, middleware which collects: proceed request time, counts response status code, other default Prometheus metrics.
A general purpose middleware
Service Fabric Not Found MiddleWare. https://docs.microsoft.com/en-us/azure/service-fabric/service-fabric-reverseproxy Keyword: X-ServiceFabric
Access Log generator for .NET Standard and .NET Core that logs HttpContext events in the CommonLog format. Original idea and code from: Chris Ross @ https://github.com/Tratcher/CommonLog
RulesChain is a small lib that simplify writing business rules in .NET environment. Its based on Rules Design Pattern and Chain of Responsability Pattern and works like ASP.Net Core middlewares.
Simple Authentication implementation for ASP.NET Core. - Basic Authentication Scheme - API Key Custom Authentication Scheme
A .NET/C# implementation of the mediator pattern with support for queries, commands and events. Has first class support for middleware and mediation contexts. This package provides support for wiring up your handlers and middleware with Microsoft.Extensions.DependencyInjection