also some silly stuff basic math http://www.aaamath.com/ or basic vocabulary http://www.aaaspell.com/vocabulary.htm or basic spelling http://www.aaaspell.com/
biology http://www.zerobio.com/ , http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookTOC.html , handwriting http://www.handwritingforkids.com/handwrite/cursive.htm