Wikipedia
Koofers
Koofers is a private company, founded in 2008 and headquartered in Reston, VA (a part of the Washington, DC metropolitan area). Koofers is an interactive community that serves the academic needs of college students through information sharing. All college students have access to the service by creating an account with their e-mail address. Many of Koofers' services span the entire academic calendar from course selection through final exams, and include interactive flashcards, course & instructor ratings, professors’ grading histories, and an online library for sharing past exams & study materials.
Koofers.com is a free service to all students and faculty at colleges and universities worldwide.