A graphical user interface builder (or GUI builder), also known as GUI designer or sometimes RAD IDE, is a software development tool that simplifies the creation of GUIs by allowing the designer to arrange graphical control elements (often called widgets) using a drag-and-drop WYSIWYG editor. Without a GUI builder, a GUI must be built by manually specifying each widget's parameters in source-code, with no visual feedback until the program is run. Such tools usually called the term RAD IDE. User interfaces are commonly programmed using an event-driven architecture, so GUI builders also simplify creating event-driven code. This supporting code connects software widgets with the outgoing and incoming events that trigger the functions providing the application logic. Some graphical user interface builders automatically generate all the source code for a graphical control element. Others, like Interface Builder or Glade Interface Designer, generate serialized object instances that are then loaded by the application. List of GUI builders C Language Based GTK / Glade Interface Designer XForms (toolkit) fdesign Intrinsics Motif C# Based UWP / Windows Presentation Foundation / WinForms Microsoft Visual Studio XAML Editor, XAML based GUI layout Microsoft Expression Blend SharpDevelop Xamarin.Forms / .NET Core Xamarin Studio C++ Based UWP / Windows Presentation Foundation / WinForms Microsoft Visual Studio XAML Editor, XAML based GUI layout Microsoft Blend Qt (toolkit) Qt Creator FLTK FLUID wxWidgets wxGlade wxFormBuilder wxCrafter (plugin for CodeLite) Projucer Ultimate++ Objective-C / Swift Based Cocoa (modern) and Carbon (deprecated). Xcode GNUstep (formerly OpenStep) Gorm Java-Based Android Studio, XML based GUI layout NetBeans GUI design tool SceneBuilder HTML/Javascript Based DreamWeaver from Adobe (Web Application User Interface Builders) — Obsolete as of 2022 Apache Cordova / PhoneGap Object Pascal Based Delphi / VCL (Visual Component Library) Lazarus / LCL (Lazarus Component Library) Flutter Framework Based Flutter (software) FlutterFlow, FlutterStudio, Nowa App builder, Tk Framework Based Tk (framework) ActiveState Komodo (No longer has a GUI builder) Visual Basic Based UWP / Windows Presentation Foundation / WinForms Microsoft Visual Studio XAML Editor, XAML based GUI layout Microsoft Expression Blend Misc Adobe Animate App Inventor for Android AutoIt Axure RP Interface Builder Crank AMETEK Storyboard Creately Embedded Wizard GEM Resource construction set Stetic LucidChart OpenWindows Scaleform Wavemaker List of development environments IDEs with GUI builders (RAD IDEs) 4D ActiveState Komodo (No longer has a GUI builder) Android Studio Anjuta AutoIt3 B4X C++Builder Crank AMETEK Storyboard Clarion Code::Blocks CodeLite dBase Delphi Embedded Wizard Eclipse Gambas