Also a great library for onboarding purposes is Hopscotch [1]. It is allows you to create a interactive tour through the UI. We are using it to introduce new users when launching the webapp the first time (Because having a 100% intuitive UI is a hard thing). We also made a study which showed us that using a onboarding mechansim really helps the user to get started and does not scare them away (which was a concern of…
Hopscotch is one of the few tour libraries that can jump to steps on a different page and (mostly) perform actions on behalf of the user.
It's also great that they have a simple, but extensible API to use custom actions to trigger the next step by e.g. a drag of a specific element.