Zachary Herrmann's Resources

https://sites.google.com/site/zacharyherrmann/blog

Free Worksheets

https://www.kutasoftware.com/

Geometers Sketchpad Resources

http://www.keycurriculum.com/sketchpad-resources

Complex Instruction Consortium:

https://sites.google.com/site/complexinstruction/

National Council of Teachers of Mathematics: Resources

http://www.nctm.org/Classroom-Resources/Browse-All/?cp=1&tx=1455

Illinois Council of Teachers of Mathematics

http://www.ictm.org/