SmartGWT is a GWT based framework that allows you to not only utilize its comprehensive widget library for your application UI, but also tie these widgets in with your server-side for data management. SmartGWT is based on the powerful and mature SmartClient library.

wxPython is a GUI toolkit for the Python programming language. It allows Python programmers to create programs with a robust, highly functional graphical user interface, simply and easily. It is implemented as a Python extension module (native code) that wraps the popular wxWidgets cross platform GUI library, which is written in C++.

Sammy is a tiny javascript framework built on top of jQuery

Sugar is a new template engine for PHP, similar in spirit to Smarty. A powerful and flexible compilation engine is used which allows for powerful expressions similar to that of PHP itself. It also features a clean and easy to understand syntax, which was created with the average designer in mind.

The JavaScript InfoVis Toolkit provides tools for creating Interactive Data Visualizations for the Web.

BWToolkit is an Interface Builder plugin that contains commonly used UI elements and other objects designed to simplify Mac development.

EZShellExtensionsMFC brings fast and painless development in MFC, ATL and C++ of any kind of Windows shell extensions including context menu extensions, property sheet extensions, infotip extensions, thumbnail extensions, "Send To" extensions, icon extensions, overlay icon extensions, drag-drop extensions, disk cleanup extensions, background menu extensions, drop extensions, Active Directory extensions, Taskbar bands and IE toolbands and explorer bars and browser helper objects. EZShellExtensionsMFC includes Visual Studio project and item wizards to jumpstart extension development.

XPS Express is an automated bridge between popular programs like Word, Excel and Internet Explorer into Microsoft’s Visual Studio to facilitate high-speed WPF document development. In conjunction with Microsoft’s XPS Document Writer, XPS Express provides a powerful alternative to form filling software such as that used to create and display PDF files.

DevForce Silverlight enables you to build data-intensive rich internet applications today. Writing a service infrastructure and exposing multiple methods for each data type is time consuming. With DevForce, you instead write your Silverlight application on top of a rich business object model that executes on both the client as well as the server. Having a full client-side domain model improves responsiveness and scalability while enabling offline operation.

NDjango is an implementation of the Django Template Language on the .NET platform, using the F# language.