From the project website (accessed 2016-10-15):
John William White's First Greek Book was originally published in 1896. The book contains a guided curriculum built around the language and vocabulary of Xenophon’s Anabasis. This digital tutorial is an evolving edition that is designed to run on both traditional browsers, tablet devices, and phones. Each lesson includes drill and practice exercises in addition to the text itself. The site also includes tab-delimited files for all of the vocabulary and grammar that can be imported into flashcard programs.