http://nces.ed.gov/nceskids/createagraph Create a Graph. (5-12) INTERACTIVE  This site from NCES is an interactive graph creation site. 

https://www.desmos.com/ Desmos  Desmos wants to help every student learn math and love learning math. But “every student” is a lot of students so we create digital math tools and let the Internet take them to anyone who wants them  We built the best-in-class HTML5 Desmos graphing calculator, which millions of students around the world use for free. That calculator catches stellar reviews in app stores and from happy users on Twitter. We also create activities on top of that calculator, helping students use a powerful tool to experience all the curiosity, beauty, and sense that math has to offer. Those activities were used so often by so many teachers around the world that we decided to create an Activity Builder, helping every teacher create digital math activities that equal and exceed the activities we create ourselves.

http://people.hofstra.edu/steven_r_costenoble/graf/graf.html Function Grapher (5-12)  INTERACTIVE  This site allows the user to enter the function s that they want to graph.

http://nlvm.usu.edu/en/nav/frames_asid_109_g_4_t_2.html?open=activities Grapher NLVM (6-12) This site is from the National Library of Virtual Manipulatives.  It is immensely valuable for a student to be able to study function behavior graphically. Among a great many graphing utilities now available to students, this one has some rather special features designed to help students at most any stage of their experience.

http://zonalandeducation.com/simpleDataGrapher/simpleDataGrapher.html Simple Data Grapher  This site is good for the beginning graphers as it includes good explanations of axes and how to enter the data into the correct fields.

http://www.portablefreeware.com/?id=1191 WZ-Grahper Function Grahper WZGrapher is function graphing and calculation program that is capable of plotting both cartesian and polar functions. It can also be used to graph numerical solution curves of integrals, to solve numerically and graph ordinary differential equations up to the fifth order, and to calculate value tables (also of ODEs) including the first derivative values.

https://itunes.apple.com/us/app/grid-lines-ordered-pair-game/id630187892?mt=8  Grid lines  This is a downloadable games that is a Battlyship style math game used to teach students the coordinate plane by plotting poings in all four quadrants.