I wrote - http://invoker.codemancers.com/ for similar use. It provides easy to use `.dev` local domain support and then ability to manage multiple processes via a Procfile or custom ini file.
Edit: Invoker doesn't seem to support the pow use case -- local configuration, not global. Inspired by the topic, I found https://github.com/riywo/anypow , which has a wrapper for non-rack applications, and can be used to make pow play nice with Procfiles.