Qt
Qt for MCUs is a complete graphics framework and toolkit with everything you need to design, develop, and deploy GUIs on MCUs. Run your application on bare metal or a real-time operating system.
The C++ code generated by the QML compiler and all of the QUL engine itself is fully compatible with the IAR compiler. To make it easy to work with Qt's tools and build system, Qt added an integration with CMake and ready-to-use kits in Qt Creator. In addition, you can download Qt Quick Ultralite libraries prebuilt with IAR.