Suspenders is a base Rails project that you can upgrade. It is used by thoughtbot to get a jump start on a working app. Use Suspenders if you're in a rush to build something amazing; don't use it if you like missing deadlines.
A gem with recipes to create Rails application templates you can use to generate Rails starter apps.
JumpStart is a script runner and template parser written in Ruby with Ruby projects in mind. It should function equally well for any project where there are many configuration steps to get up and running.