PyGUI - A simple API that enables developers to create user interfaces with native elements for Python applications.
PyQt - Riverbank | Software | PyQt | What is PyQt?
wxPython - wxPython is a GUI toolkit for the Python programming language.
PySimpleGUI - A simple to use GUI that can create custom GUIs
MD Python Designer - A drag and drop GUI Designer that uses a combination of Tkinter and its own code.
Tkinter - Tkinter is a Python wrapper for Tcl/Tk that offers classes to create various graphical user interfaces.