At the moment there are no automatic plugins. However if you look at the bottom of every page, you will notice a "Developers" link. From there you've got access to two different styles of API - Web Services and JSON.
Rather than us trying to anticipate every type of integration we thought it would be easier to open the application up that way. My understanding of Composite Apps etc is that a Web Service provides enough of an interface to get data as required.
If this useful to you?