A large, open source app. For evaluating how to solve big-app problems, size, on its own, is meaningless, except to show that the hard problems can be done, bec

A large, open source app. For evaluating how to solve big-app problems, size, on its own, is meaningless, except to show that the hard problems can be done, because it doesn't show how; and open-source, on its own, is meaningless, because it doesn't run into those problems. So adamnemecek needs both to fit his query.