| Components | 
| Environment | Classes providing various global services to your application such as
event handling, access to system settings, internationalization, etc. | 
| Mainwindow And Friends | Everything you need for a typical modern main application window
(menus, toolbars, workspace, ...) | 
| Standard Dialogs | Ready-made dialogs for file-, font-, color-selection and more. | 
| Basic Controls | The GUI primitives like buttons, combo-boxes, scrollbars, etc. | 
| Advanced Controls | Advanced user interface controls like listviews, progress bars etc. | 
| Organizers | User interface organizers like splitters, tab books, button groups, etc. | 
| Help System | Classes providing for all forms of online-help in your application. | 
| Framework | 
| Object Model | The framework's underlying object model. | 
| Abstract Widgets | Abstract widget classes available for subclassing. | 
| Drawing And Printing | Classes providing drawing (and thus printing) primitives | 
| Drag and Drop | Classes dealing with drag and drop and the necessary mime type
encoding and decoding. | 
| Widget Appearance | Appearance customization with styles, fonts, colors etc. | 
| Geometry Management | Casses handling automatic resizing and moving of widgets. The Qt way
of composing complex dialogs. | 
| Utilities | 
| General Tool Classes | Generic collection classes like list, queue, stack, string etc. | 
| Image Processing | Digital image coding, decoding and manipulation | 
| I/O Handling | Classes providing I/O, file and directory handling. | 
| Time And Date | Classes for handling date and time. | 
| Miscellaneous | Various other useful classes |