I was looking at Python GUI libraries a few days ago, and it looks like Dropbox uses PyQt: https://en.wikipedia.org/wiki/PyQt#Notable_applications_that_use_PyQt

I was looking at Python GUI libraries a few days ago, and it looks like Dropbox uses PyQt: https://en.wikipedia.org/wiki/PyQt#Notable_applications_that_use_PyQt https://en.wikipedia.org/wiki/PyQt#Notable_applications_that... (That information might be incorrect or out-of-date.)