The Internet Public Library (IPL) features a searchable, subject-categorized directory of authoritative websites; links to online texts, newspapers, and magazines; and the Ask A Question online reference service.
Fact Monster is a free reference site for students, teachers, and parents. Get homework help and find facts on thousands of subjects, including sports, entertainment, geography, history, biography, education, and health.
Great ways to practice grammar and other writing issues. Not only helps work and improve as a writer, but provides powerpoints and helpful hints to use to work with students in learning language.