[FooBarWidget]

Phusion Passenger author here.

Passenger does more than only providing process supervision. It automates the reverse proxying rules for you so that you don't even have to configure that.

It automatically launches Meteor on a right port so that you don't have to think about which port to choose, and whether it conflicts with something else.

It adds administration tools so that you can see what your app is doing; node-forever doesn't do this.

The list goes on. The point and goal of Passenger is to make production deployments significantly easier and less complex. We have future plans to support per-app daemon management too so that you can manage your background workers etc with minimal hassle, and plans to release full-stack images so that you don't even have to setup the machine.