acts_as_authenticated – it is a very straightforward authentication plugin for Ruby on Rails. Using acts_as_authenticated you can quickly get to a site that allows for login, email confirmation, and some very simple user profile capabilities very quickly. As far as open source project documentation goes, this particular component is perfect. It is not a linear “official” document, instead it is more of a Wiki (without the confusion of a Wiki). It is task-oriented, and “extensible”. Good technical documentation is less like a book and more like a “Choose Your own Adventure”. Stikipad looks like it provides a good platform for technical documentation.