Softschools.com has math, language arts, science and social studies. One side is for the students to use and the other side is for teachers to use to print out worksheets that may be printed and used without copyright infringement.
This site has reading, math, science, printables, and much, much more. The site hyper-links you to another site. Those sites are rated from one star to four stars. Most of this site is for teacher use.
Great Site! This site has different links for many subjects. All the links are in order of subjects and the links are also in ABC order. Many of the sites are "games" that students can use independently with very little instruction.