I have tried to find them through Google but haven't had much luck. I know the number of 3rd party controls is not as big as .NET or Java, but surely there are some out there better than what comes with the library?
Is Qt Creator free? There is an open-source license which is free and a commercial license. The commercial license (Qt creator and Qt SDK) starts at $459/month.
To add widgets in Qt Designer: In the Qt Creator Edit mode, double-click the notepad. ui file in the Projects view to launch the file in the integrated Qt Designer. Drag and drop widgets Text Edit (QTextEdit) to the form.
Widgets are the primary elements for creating user interfaces in Qt. Widgets can display data and status information, receive user input, and provide a container for other widgets that should be grouped together. A widget that is not embedded in a parent widget is called a window.
Qwt is a source for graphing and technical components and Solutions Catalog has the property browser as well as many other useful widgets.
Also available are the Embedded Widget Demos, ofi-labs, and qt-labs.
ofi-labs is by a former Qt employee, the others are official.
Edit: Almost forgot, diagramming is covered by this example: GraphicsView - Diagram Scene
free: qt-apps.org
proprietary: qt-prop.org
there are Widgets and Components categories
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