[danpalmer]

As I kind of alluded to in my comment, I'm not sure many of these things need to be web apps. OS level sandboxing has come a long way in the last ~10 years, and need fewer of the benefits of the web (like publicly addressable resources), and more of the benefits of desktop apps (like filesystem access). Web tech is improving its support for the latter, but I think we could do better if we designed a system today, rather than using one mostly designed between 95-05.