Tutorhub is a site/network designed to help students w/ homework and tutoring. This is done by posting a question and then getting free answers (similar to an online forum). Also, a student can look through previous questions/answers and even find an online tutor for help. These tutors are paid as a "pay as you go" service.
Another nice feature of Tutorhub is the educational chat room that is built in for online collaboration.
I highly recommend checking out Tutorhub by clicking here!!