Chegg is available every hour of every day. The website is not free but they do offer a seven day free trial, as well as some other deals and an area where you sell the books you no longer need. You may not think it will be worth it, but just visit the website to see and make the decision for yourself.
The World of Math is useful not only for grade school math but college math as well. Offering free classes as well as free help in tutoring you through your mountain of math problems is a real bargain, you would be hard pressed to find a deal like that offered anywhere else. Clicking on Homework Help gives you a page full of the different levels of math and you can select the one that is troubling you. The World of Math Online is centered towards perfecting your math skills, not helping you cheat.
Here any college student can sign up and receive help for free. HippoCampus offers help in many subjects, including math, humanities and social science, to name a few. Here you are provided with resources, video tutelage as well as informative lectures that are all keyed in providing you with the help you need on your homework. If you are looking for an in-depth advantage in a subject then HippoCampus is what you need.
eNotes is the best place to go for help in English or any literature field. Instead of just providing you with a study guide, eNotes gives you full access to a section where you can ask your questions to a group. The answers might not be instantaneous but the homework section is highly beneficial and totally free.
Need a fact for your paper? Well FactMonster is your best option in finding it. No matter the genre, whether it is history, art or science, FactMonster will help you find it. While the site is keyed towards grade school any college student who needs help on a project can use it. On FactMonster you can find obscure facts that you normally might have missed carrying on the research without help.