A number of Ruby on Rails applications use Devise for basic account management and authentication. It's about as close as you can get to a cookie-cutter experie

A number of Ruby on Rails applications use Devise for basic account management and authentication. It's about as close as you can get to a cookie-cutter experience. As long as you follow the workflow, it's pretty straight forward to handle. Drop in the plugin you want, configure the API keys, and then wire it into your User model. Then you can customize the urls, views, and emails. You still have to read a fair amount of documentation and a lot of developers don't like the extra up-front work and reinvent the wheel because it's "simpler".