Ask HN: Do you know any web application template starter kit?

Most of the web applications these days have some standard components such as user registration, login, signout, updating profile etc. If you add saas into the mix, that would include billing, membership tiers etc. It would be nice if these are available as part of a starter kit, so a developer can focus on the core app. This helps a lot in developing prototypes fast and a bit more complete.

So, do you know any good web application starter kit that includes some of the above features? It could be in any language.