What tools and technologies have you used in developing user interfaces?

When developing a user interface in Python, I used the following tools and technologies:

• Tkinter — the standard library for creating simple GUI applications.
• PyQt / PySide — more powerful frameworks for creating cross-platform applications with rich interfaces.
• Kivy — for developing multitouch and mobile applications.
• HTML/CSS/JavaScript with frameworks (such as Flask or Django) for web interfaces.

For example, for a desktop application with a graphical interface, I used PyQt, which allowed me to create complex windows with buttons, lists, and other control elements.