Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.
PyQt - Riverbank | Software | PyQt | What is PyQt?
wxWidgets - wxWidgets: Cross-Platform GUI Library
Dear PyGui - Dear PyGui is a simple to use (but powerful) Python GUI framework. Dear PyGui provides a wrapping of Dear ImGui which simulates a traditional retained mode GUI (as opposed to Dear ImGui's immediate mode paradigm).
FLTK - Fast Light Toolkit - Fast Light Toolkit (FLTK)
PySimpleGUI - A simple to use GUI that can create custom GUIs