tomdoc

https://github.com/defunkt/tomdoc

TomDoc is flexible code documentation with human readers in mind. The tomdoc gem is a Ruby library to discover and display TomDoc'd methods and classes. Given a Ruby file with TomDoc'd methods, tomdoc can generate HTML or print to the console. You can use it to query up a single method or a group of methods, and it's usable from irb. If you're using TomDoc, tomdoc is for you.