I am not sure if I picked right category, but I am curious.
Do you have any websites/apps/etc. that you would descirbe as a good UI/UX design? Why?
These are vastly different things.
You might find this useful:
I meant any examples of pages, web applications that you would describe as a well-designed.
Have a look at the Slide App. They have a great on/offline UX and UI.