wxWidgets - wxWidgets: Cross-Platform GUI Library
python pillow - The friendly PIL fork (Python Imaging Library). Contribute to python-pillow/Pillow development by creating an account on GitHub.
Electron - Build cross platform desktop apps with web technologies
OpenCV - OpenCV is the world's biggest computer vision library
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
pgmagick - Yet Another Python wrapper for GraphicsMagick