Course Hero
What is Course Hero? This is how they describe themselves:
"Course Hero was built by students to help students!
"Course Hero is an open social learning network for students, educators and self-learners to publish, share and view academic resources online. In support of the Open Educational Resources (OER) movement, Course Hero provides critical and timely learning assistance through our user-contributed materials and most importantly online study groups comprised of students, educators and self-learners."
