A while back I was offered https://wiki.sagemath.org/interact/ for some examples of user interfaces. Specifically I was interested in the "Web application" section, as that is most attuned to what I am trying to do. I have two issues with this page.
Most (if not all) of the web application examples are broken (or easily broken) when one tries to run them on their own machine or just within the web browser. It makes it difficult to learn by example and/or use the examples to build upon.
The examples are outdated. If there is more capability and/or beauty than what is shown (and I hope there is) it should be offered as an example there. With robust GUI capabilities in R, Python, Java, etc., one would really hope that Sage, with all of its great mathematical capabilities, could offer some GUI options that are more modern.
Just to offer a couple examples of what I'm talking about, GUI's made with wxPython in Python, or Shiny in R, are much more attractive than what is shown of the Sage examples.