It is a great software for handling UI and it's working, all at one place. Very useful once you get to know all its details.

Qt Creator is a cross-platform C++, JavaScript, and QML integrated development environment. What I like most is the vast range of possibilities this platform offers: It includes a visual debugger, default compilers, and lots of libraries that make it incredibly easy to use. I used it to create interfaces to interact with 3D and physical models, and it is particularly easy to use and learn. You can embed buttons, layers, and everything you need to create an easy-to-use window that adapts to resizing while keeping things in place. The debugging and traceback functionality is incredibly helpful when trying to find where an issue lies in your code. You can easily set breakpoints and jump to the section of code you believe is causing the issue and see the local variables and their content in real-time. The UI/form designer is a huge help when building complex interfaces, as such tasks would require tedious manual XML entry by hand otherwise. You can also preview any UI you design by pressing alt+shift+R, which is useful when testing how the window's sizing options will work and how it will affect your controls.

The ease by which a GUI can be added to already existing C++ code base