wxPython
PyQt
Kivy
Qt
Tkinter
GTK
wxWidgets
Electron
Axure
Balsamiq
Invision
Zeplin
Moqups
Proto.io
ProtoPie
Flinto
wxPython
AxurePyQt - Riverbank | Software | PyQt | What is PyQt?
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Kivy - Open source Python framework for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps. Installation on WindowsInstallation on Windows. Installation; What are wheels .
Invision - Prototyping and collaboration for design teams
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.
Zeplin - Collaboration app for UI designers & frontend developers