Open Source ASP.NET User Interface (UI) Software

With its familiar .Net visual drag n' drop, WYSIWYG designer and HTML5 rendering engine, Visual WebGui is the natural choice for core Visual Studio developers who want to create native quality, cross-platform enterprise level HTML5 apps in VB.NET or C#.

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

FornaxAjaxToolkit is a complete library of ASP.net controls for ajax development.

A JavaScript presentation layer framework. It proposes a complete separation of view logic and design. Its components are designed by its role and not by its screen appearance, reducing drastically the API.

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.

Rico is a JavaScript library for creating rich internet applications. Version 1 is JavaScript only. Versions 2 & 3 include server-side code (asp, asp.net, and php) to make creating web apps even easier. Versions 1 & 2 are based on Prototype and include grids, calendar & tree controls, drag & drop, and cinematic effects. Version 3 goes beyond Prototype, and includes support for jQuery, MooTools, Dojo, Ext, and BBC Glow libraries. Version 3 is only available in the SVN repository. The rico3.net branch includes a .net server control.

ShowX is a .NET set of libraries aimed to provide automatical representation of classes over Web or Windows application, by using controls to automate operations over those class intances

Webstensible is an extensible application layer for building robust, web-based business applications. The framework is written in DotNet. All components are loaded via reflection and designed to be replaced to match ever-changing business requirements.

XForms4Net, the XForms .NET library.

ZCore is a set of Creative Studio for designing, testing, building ... solutions based on .NET framework. Contains UML designs tools, code editor & build tools, debug & test tools, user interface create tools ...

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.