Read John is an inductive course in New Testament Greek based on reading a graded series of fragments of John's Gospel. I'm trying out an initial version on a couple of friends at the moment but plan to eventually make it available online.
If you are interested in the theory and code behind the creation of the reader, see Graded Reader.
The original post was in the categories: new_testament_greek graded_reader but I'm still in the process of migrating categories over.