The Maya interface is built using the Qt framework. You can create custom UI for Maya using Qt Designer. For Windows and Linux users, Qt Designer is installed with Maya. For Mac OS X users, you can find Qt Designer directly at the Qt Development Tools website; or, you can build Qt from source. Maya 2014 uses a version of Qt 4.8.2 that has been modified by Autodesk to include some changes needed by the Maya UI. This modified version is provided with the Maya install and can be found in the <installation directory>\opensource folder. For detailed instructions, see Using Qt in Plug-ins in the Working with Qt chapter of the API Guide.
You can load your custom UI into Maya using the loadUI command.
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