I have re-used modules many times from different Phoenix projects: they are very portable. The only wiring that was needed to install them was to reference them somewhere (e.g. in a plug or a controller). It’s not a plug-and-play as, say, a WordPress plugin, but 1 size doesn’t always fit all. Sometimes the “simplicity” in having things as easy to install as a WordPress plugin backfires when you need to customize it, and jail-breaking the functionality out of its carefully defined environment is harder than just wiring in more generic modules.
Phoenix Plugs might be the middle ground there: they revolve around a well-documented struct and are easy enough to reference in various projects. They can be used to handle an entire request, from soup to nuts, so I would recommend giving them a look before trying to balance multiple Phoenix apps under an umbrella or some other more sophisticated solution.
