Pluto!! Code name only to this point however. Maybe they don't really consider it an application at this point, or they did, but now they don't think it's ready. I find the name notoriously ironic- Pluto is a failure as a planet, it just didn't pass muster it the long run!
IMO the next secure application should be named "BLOB" - it absorbs all data and locks in sensitive information.
Skreal