Top 20 NuGet appsettings Packages

NLog.Extended.dll provides MSMQ target and AppSetting renderer
Cross platform Xamarin AppSettings reader
Contains a generalize implementation for handling complex configuration/settings within an application. Based off the design of Serilog
Contains an implementation of a overrider for AppConfig for the Invisionware Settings Library
Contains an implementation of a overrider for CommandLineParser for the Invisionware Settings Library
appsettings.json writer
Provides a central location for an instance of IConfigurationRoot to be used as the "default" configuration by .NET Standard libraries and .NET Core applications. Replaces some of the functionality of the .NET Framework System.Configuration.ConfigurationManager class.
Contains an implementation of sink for Microsoft ConfigBuilder for the Invisionware Settings Library
Contains an implementation of sink for System ConfigurationManager for the Invisionware Settings Library
Contains an implementation of Sink Read/Write for AzureConfigurationManager for the Invisionware Settings Library
Simple and extensible way to make web.config/app.config/env vars/whatever easier to read and strongly typed!
Contains an implementation of a overrider for AzureConfigurationManager for the Invisionware Settings Library
Contains an implementation of AppSettingsConfigManager for System ConfigurationManager for the Invisionware Settings Library
Contains an implementation of AppSettingsConfigManager for AzureConfigurationManager for the Invisionware Settings Library
An abstraction of appsettings allowing easy and testable retrieval of settings asynchronously from arbitrary sources.
A .NET configuration library to simplify application configuration
The FSharp.Configuration project contains type providers for the configuration of .NET projects.
Simple library for reading and validating appsettings with ease.
The Config Helper Pro Library has the ability to manage all your .NET configuration needs. Read/write to the registry, application/web config, and INI files with a single line of code. Everything is 100% managed code.
Makes mapping key/value stores (appSettings, environment variables, NameValueCollections...) to POCs dead simple and highly extensible.