AvalonDock is a WPF control for adding a docking layout system to your application.

A collection of code in C# ranging from ActiveRecord, CSV, Configuration, Logging, Domain-Models, Repository, Authentication, Command-Line Parsing, HolidayCale

CuttingEdge.Conditions is a library that helps developers to write pre- and postcondition validations in their C# 3and VB.NET code base.

Craig's Utility Library contains various utility classes used in both web and desktop programming. The library contains classes to handle tasks such as encryption, compression, Microformats, serialization, dealing with Exchange, Active Directory, Twitter, Netflix, threads, etc.

Clarity Consulting Inc. http://www.claritycon.com developed the original Facebook Developer Toolkit for the Microsoft Visual Studio Express Team. We have seen lots of feedback on suggestions on improving the codebase. We worked with Microsoft on an idea to keep the code relevant and up to date for all the Facebook Developers. Together we decided that hosting the source here on CodePlex will be the best way to track items and allow community involvement in the source. We encourage anyone to get involved. We would like to thank Microsoft for the great support they are giving this project, and the effort they are willing to commit to helping us keep the library up to date. This project contains .NET wrappers to the Facebook API. Also, includes sample projects and controls. We are going to start by trying to maintain both the vb.net and C# code bases. We will see how it goes.

This is a WPF library containing a powerhouse of controls, frameworks, helpers, tools, etc. for productive WPF development. If you have ever heard of Drag and Drop with Attached properties, ElementFlow, GlassWindow, this is the library that will contain all such goodies.

Wraps Google Maps API as ASP.NET custom control.

Linq2Twitter is an open source LINQ Provider for the Twitter micro-blogging service. It covers the entire Twitter API and supports multiple .NET technologies.

Mvp.Xml project is developed by Microsoft MVPs in XML technologies and XML Web Services worldwide. It is aimed at supplementing .NET framework XML processing functionality available through the System.Xml namespace and related namespaces such as System.Web.Services. It is documented extensively through weblog posts. All the project's classes contain extensive tests to ensure its quality, as well as the peer review among this highly focused group of XML lovers. Mvp.Xml project currently provides .NET implementations of EXSLT, XML Base, XInclude, XPointer as well as a unique set of utility classes and tools making XML programming in .NET platform easier, more productive and effective. Mvp.Xml project supplements .NET functionality, but as .NET platform evolves some parts of the Mvp.Xml library become redundant. Beware that we will be dropping support for anything that become supported natively in .NET. Mvp.Xml project supports both .NET 1.1 and .NET 2.0. While both codebases have much in common, they are different codebases. Mvp.Xml for .NET 1.1 is mostly frozen, while Mvp.Xml for .NET 2.0 is under active development.

NuGet has moved from codeplex to GitHub. This site is no longer monitored. NuGet is the package manager for the Microsoft development platform including .NET.

The Unity Application Block (Unity) is officially under new ownership. https://github.com/unitycontainer/unity