Stars
The WPF-based text editor component used in SharpDevelop
SharpShell makes it easy to create Windows Shell Extensions using the .NET Framework.
Castle Windsor is a best of breed, mature Inversion of Control container available for .NET
Framework for building a complete MSI or WiX source code by using script files written with C# syntax.
Gemini is an IDE framework similar in concept to the Visual Studio Shell. It uses AvalonDock and has an MVVM architecture based on Caliburn Micro.
Collection of extension methods for the XAML WriteableBitmap
A OpenSource Updated fork of https://github.com/xceedsoftware/wpftoolkit
Open source NLP tools (sentence splitter, tokenizer, chunker, coref, NER, parse trees, etc.) in C#
XAML Viewer is a lightweight XAML editor.
A chess game with a clean architecture and design, written in C#/WPF.
Visual Scripting Environment for R and Data Science
A differencing utility for Window desktop written in C#.
A set of tiny .NET libraries with various sorts of common utility functions
Customized WPF controls, RangePanel with custom vertical/horizontal positioning, RangeItemsControl with bindable ItemsSource and Visual Studio-like scrollbar with markers
Easily read/write files on Phones/Tablets that connect to your PC via USB. Deal easily with any external drive, even if you can't find it in the available drives (DriveInfo.GetDrives)
A WPF/MVVM control for selection of values in different units with automatic unit conversion
This is an implementation of the Cologne phonetics algorithm (Kölner Phonetik) for .NET