Top 20 NuGet web.config Packages

Consul configuration source for Stronk.
Simple yet extensible library for mapping settings to strong types.
A library for encrypting web.config files.
FluentValidation extensions for Stronk.
A library that makes it easy to register routes through the .NET configuration files. Supports page routes, MVC, custom routes (IRouteHandler and RouteBase), constraints (RegEx and IRouteConstraint), defaults, parameters and tokens. Written in C# for .NET 4.
Simple MSBuild Task that helps with maintaining app.config and web.config across multiple projects, and build configurations. Create one app.config/web.config template and share it across multiple projects with different configurations for each build target. Supports * Recursive configuration tra...
T4Configuration is a template that generates a static class in C# of your App Settings and Connection Strings located in your app.config or your web.config.
Enable SimpleMembershipProiver+SimpleRoleProvider for MVC4
Transform web.config and app.config (or any *.config!) files from the command line.
SwissKnife.T4.AppSettings is generates strongly typed AppSettings class.
The simplest .NET configuration that could possibly work. Use Json in your .NET config files. Use simple POCO classes for all your config. Works with Azure ServiceConfiguration.cscfg too!
This T4 template was based on the orginal work of J Wynia from his blog post at http://wynia.org/wordpress/2010/04/t4-template-for-appsettings-access-in-config-files
.Net Dev Utils
The DbMap, Mail, WebProxy, and Credential app.config utilities.
A tiny helper framework for providing environment-specific app/web.config configurations, and other configuration utilities.
Adds .svg and .svgz `mimeMap` entries to web.config, so that IIS can serve them correctly.
In ASP.net site use single web.config for all servers (dev, test, prod, etc), simple add this Extension class to read Settings or ConnectionString