Answer 1

Kivy

Kivy is an OpenGL ES 2 accelerated framework for the creation of new user interfaces. It supports multiple platforms namely Windows, MacOSX, Linux, Android iOS and Raspberry Pi. It is open source and comes with over 20 widgets in its toolkit.

PyQT

PyQT is one of the favoured cross-platform Python bindings implementing the Qt library for the Qt (owned by Nokia) application development framework. Currently, PyQT is available for Unix/Linux, Windows, Mac OS X and Sharp Zaurus. It combines the best of Python and Qt and it up to the programmer to decide whether to create a program by coding or using Qt Designer to create visual dialogs.
It is available in both, commercial as well as GPL license. Although some features may not be available in the free version, if your application is open source, then you can use it under the free license.

Tkinter

Tkinter is commonly bundled with Python, using Tk and is Python’s standard GUI framework. It is popular for its simplicity and graphical user interface. It is open source and available under the Python License.
One of the advantages of choosing Tkinter is that since it comes by default, there is an abundance of resources, both codes and reference books. Also with the community being old and active, there are many users who can help you out in case of doubts. Here are some examples to get you started.

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