http://www.khanacademy.org/
http://http://www.mathgametime.com/subject/algebra
http://www.brightstorm.com/math/algebra/
http://flexmath.ck12.org/subject/algebra
www.aplusmath.com
www.mathplayground.com
www.eduplace.com/math
http://www.mathleague.com/help/help.htm
www.funbrain.com
http://www.aaamath.com/