A project can be forked from an existing project of someone else. All apps and services of the existing project will be duplicated and adapted for the new user under new username. When you visit someone’s profile, in their project list there is fork button besides each project. Give it a push and the project will be forked to your account. Of course you first need to login to your account.
If you find a project fit for your needs, for example a registration project that with few minor changes will get the job done for you, forking it would be the easiest way to get you started immediately.