| QAccel | Handles keyboard accelerator and shortcut keys
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| QAccessible | Enums and static functions relating to accessibility
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| QAccessibleInterface | Defines an interface that exposes information about accessible objects
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| QAccessibleObject | Implements parts of the QAccessibleInterface for QObjects
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| QCustomMenuItem | Abstract base class for custom menu items in popup menus
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| QDoubleValidator | Range checking of floating-point numbers
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| QErrorMessage | Error message display dialog
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| QFileIconProvider | Icons for QFileDialog to use
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| QFilePreview | File previewing in QFileDialog
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| QFocusData | Maintains the list of widgets in the focus chain
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| QIntValidator | Validator which ensures that a string contains a valid integer within a specified range
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| QKeySequence | Encapsulates a key sequence as used by accelerators
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| QMacMime | Maps open-standard MIME to Mac flavors
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| QMenuData | Base class for QMenuBar and QPopupMenu
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| QMimeSource | Abstraction of objects which provide formatted data of a certain MIME type
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| QProcess | Used to start external programs and to communicate with them
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| QRangeControl | Integer value within a range
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| QRegExp | Pattern matching using regular expressions
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| QRegExpValidator | Used to check a string against a regular expression
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| QSettings | Persistent platform-independent application settings
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| QSignal | Can be used to send signals for classes that don't inherit QObject
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| QSplashScreen | Splash screen that can be shown during application startup
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| Qt | Namespace for miscellaneous identifiers that need to be global-like
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| QUrl | URL parser and simplifies working with URLs
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| QUrlInfo | Stores information about URLs
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| QUrlOperator | Common operations on URLs
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| QValidator | Validation of input text
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| QVariant | Acts like a union for the most common Qt data types
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| QWindowsMime | Maps open-standard MIME to Window Clipboard formats
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