Mrs. Mitchell's Virtual School I haven't looked around this site much yet, but it seems there are links for most grades.
Life Hacker U Free, online university level courses.
Periodic Table Printables of the elements in words or pictures.
Human Body coloring pages From Crayola.
Biology coloring pages Printable pages.
Biographies and activities On a site called Teachers pay Teachers. This is a free download, you just have to make an account.
Famous Musicians Pages For notebooking.