http://atticgreek.org/index.html
AtticGreek.org is the home of the revised Ancient Greek Tutorials by Donald
Mastronarde, adjusted to conform to the changes made in the second edition of
Introduction to Attic Greek (University of California Press 2013) and to
provide additional supplements to that book. Many parts of this site will be
helpful, however, to anyone beginning or reviewing the study of ancient Greek
with any textbook.