The primary offer is English Pro, a kind of interactive control panel, designed to teach spoken as well as written English, and to which you can add new lessons as the site is updated weekly. There is also a downloadable teacher's section. You'll need to register and receive a password to use the games. Dr. Reinhold Aman's work on the very raw edges of the language is both scholarly and intensely funny. If you are under 21 years of age, immature, a legal scumbag, a shallow journalist, a p.c. creep, or offended by words, just go away.
Nothing is sacrosanct.
All points of view are equally likely to be offended and insulted. Reinhold does have his strong biases and makes no attempt to avoid them. There's a lot here for everyone, masochists as well as linguistics scholars. Expect surprises, pitches to buy hard copy Maledicta products, and great samples. On-line is produced by the Department of English at the University of Toronto.