GitHub repository: tianhm/PySimpleGUI
Primary language: Python
Description: Launched in 2018 Actively developed and supported. Supports tkinter, Qt & WxPython. Create custom layout GUI's simply.  Python 2.7 & 3 Support. 100+ Demo programs & Cookbook for rapid start. Extensive documentation.  Examples using Machine Learning(GUI, OpenCV Integration,  Chatterbot), Floating Desktop Widgets, Matplotlib + Pyplot integration, add GUI to command line scripts, PDF & Image Viewer. For both beginning and advanced programmers .