[ThePhysicist]

The Apple human interface guidelines are a good source of information: https://developer.apple.com/design/human-interface-guideline...

If you want something that isn't tied to Apple you can find a list of similar guidelines here: https://en.wikipedia.org/wiki/Human_interface_guidelines#Exa...

Personally I find that KDE, gnome and xfce have great UI, you can find their guidelines in the list above.

Regarding implementation I'm a big fan of Qt, there's an excellent python binding as well (PyQt), which makes it easy to get started especially if you already have your logic implementing in Python.

[prando]

Thanks much for your kind reply. The first link has a lot of guiding philosophy despite it being attached to Apple, I will try incorporating this. I am a FW developer and when I developed this GUI and put it in few users' hands, I realized how counterintuitive something can be in terms of usability.