This site is an excellent series of free online tools to explore for use in your classroom. Be sure to add those items that would be useful in your classroom to this diigo site.
"Studyladder is a highly effective, logically organised, Mathematics and Literacy program. It has been developed by experienced educators to inspire and motivate learning. It is suitable for Elementary and Junior High School students and is very easy to use - students simply login with a username and password to access all the learning materials. "