Open Source C# User Interface (UI) Software for Linux

Windows Presentation Foundation (WPF) is a UI framework for building Windows desktop applications. WPF supports a broad set of application development features, including an application model, resources, controls, graphics, layout, data binding and documents. WPF uses the Extensible Application Markup Language (XAML) to provide a declarative model for application programming. WPF applications are based on a vector graphics architecture. This enables applications to look great on high DPI monitors, as they can be infinitely scaled. WPF also includes a flexible hosting model, which makes it straightforward to host a video in a button, for example. The visual designer provided in Visual Studio makes it easy to build WPF application, with drag-in-drop and/or direct editing of XAML markup. WinForms is another UI framework for building Windows desktop applications that is supported on .NET (6.0.x/5.0.x/3.1.x). WPF and WinForms applications only run on Windows.

FlaUI is a .NET library which helps with automated UI testing of Windows applications (Win32, WinForms, WPF, Store Apps,...). It is based on native UI Automation libraries from Microsoft and therefore kind of a wrapper around them. FlaUI wraps almost everything from the UI Automation libraries but also provides the native objects in case someone has a special need that is not covered (yet) by FlaUI. Some ideas are copied from the UIAComWrapper project or TestStack.White but rewritten from scratch to have a clean codebase. To use FlaUI, you need to reference the appropriate assemblies. So you should decide, if you want to use UIA2 or UIA3 and install the appropriate library from NuGet. You can of course always download the source and compile it yourself. The entry point is usually an application or the desktop so you get an automation element (like a the main window of the application). On this, you can then search sub-elements and interact with them.

Avalonia is a cross-platform UI framework for dotnet, providing a flexible styling system and supporting a wide range of Operating Systems such as Windows, Linux, macOS. Avalonia is mature and production-ready. We also have in beta release support for iOS, Android and in early stages support for browsers via WASM. Avalonia is open source, free to use, and always will be. Clone the source today to dig deeper. The free VS extension provides everything needed to start, including a XAML previewer. JetBrains deep understanding of Avalonia shines through with rich Rider and R# support. Deploy to the platforms you care about with ease. Leverage existing knowledge, code and packages to kickstart your project. Get the support your project needs with one of our commercial support agreements. Help you can count on. JetBrains delivers huge productivity gains for Avalonia developers.

GLWidget is a cross-platform GTKSharp widget that supports OpenGL using the OpenTK library inside a GTK# application using C#.

Very useful framework library, contains many frequent used code snippets, algorithms, data structures, WinForms & APS.NET controls for all-day work.

Use this to easily add database connection management to a .Net client application. Provides an interactive GUI to set and test database connection parameters. Manages storage and retrieval of connection strings with minimal configuration.

.NET Assemblies that integrate and expands on various advanced solutions for DataBinding, Reflection, UI Wrapping and more. Fuel your .NET applications with RAD techniques and ready-to-use code that picks up where the .NET framework left off.

A docking framework library for Gtk Sharp developments.

A framework for all-platform GUI-development based on completely separating business from presentation logic and introducing methods of abstraction that allow stepwise refinement of the GUI-definition.

LITS is a game development engine, which offers basic implementations of the most needed interfaces: Graphic, Network, Sound and Input. All interfaces have several (parts plattform independent) wrappers which can be choosen as needed.

Mobile.Windows.Forms offers functionality for developing mobile applications using .NET Compact Framework 1.0, including multiple screen configurations, keyboard navigation and XML based user interface definitions.

The NTS CMS, NTSManager, is an ASP.Net (C#) based Content Management System. A high performance app serves web pages directly from RAM. Provides browser-based editing and adding of functionality modules. Developed in SharpDevelop.

A next generation framework to wire existing javascript frameworks (Ext, Qooxdoo, Dojo, etc.) to Server code written in any .NET language.

OSGi.NET, a dynamic modularization framework, which is a .NET implementation tightly based on OSGi specifications from OSGi Alliance, is designed and developed by Xi’an UI Information Technology, Inc., in China, from 2008, it's totally free and can be redistributed with any production. This project is mainly focus on explaining how to develop OSGi.NET based application, and how to integrate with third part libraries to speed up our development.

THIS PROJECT IS DEAD. For the real appcelerator project, please visit http://www.appcelerator.com

Ooui (pronounced weee!) is a small cross-platform UI library for .NET that uses web technologies. It presents a classic object-oriented UI API that controls a dumb browser. With Ooui, you get the full power of your favorite .NET programming language plus the ability to interact with your app using any device. Make sure to add a reference to Ooui before you start running! With just code, a web server that serves the HTML and web socket logic necessary for an interactive button will start. Ooui has been broken up into several packages to increase the variety of ways that it can be used. When the user requests a page, the page will connect to the server using a web socket. This socket is used to keep the server's in-memory model of the UI (the one you work with as a programmer) in sync with the actual UI shown to the user in their browser. This is done using a simple messaging protocol with JSON packets.

XUP (Extensible User Interface Protocol) is a SOAP-based protocol for delivering events and incremental UI updates. This project builds a web application development framework on top of XUP, consisting of a client, a server toolkit, and a template viewer.

An advanced, composable, functional reactive model-view-viewmodel framework for all .NET platforms! Describe what you want, not how to do it & rejoice in the increased readability of your code. Code is communication between people, that also happens to run on a computer. If you optimise for reading by humans, then over a long time your project will end up better. Create re-usable chunks of functionality that can be seamlessly integrated into your reactive pipelines. These chunks might be widely applicable, or specific to your application. Regardless, you have the power to write and test code once, and leverage it many times over. Any device, any platform. Share business logic between your mobile and desktop applications. ReactiveUI has first class support for Xamarin Forms, Xamarin.iOS, Xamarin.Android, Xamarin.Mac, Tizen, Windows Forms, Windows Presentation Foundation (WPF), & Universal Windows Platform (UWP).

Robot Controlling System (RCS) - is a .NET-oriented software group for controlling remote mechanical objects, debuging and programming them by .NET-languages

This project provides a framework upon which a Silverlight user interface can be created. It provides control navigation, pop-up windows, data-bound controls, and some basic user controls. The framework is XAML-driven and coded in C#.

TRIAD is a browser-independent and platform-independent framework for Rich Internet Aplications.

XForms4Net, the XForms .NET library.

XOffice is a UI toolkit for developing cross-platform applications with the Microsoft Office style. XOffice provides an implementation of key MS Office UI components, including the new Ribbon component introduced in Office 2007.

XUL# is a c# library for writing web and stand-alone application with Mozilla XUL user interface. The same application can be hosted into ASP.NET or Windows.Form (or Mono) Language: C#, XUL, HTML

ControlMaster is a collection of light-weight controls library and toolkit written in c#. The goal is to provide a set of cookie-cutter web UI controls for any ECMA based .NET framework, features include AJAX style UI, plugins, and many many more.