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This is a powerful, FREE, graphing calculator for iPad/iPod.

Though the app is priced at $29.99, it is still less expensive than purchasing a new graphing calculator. 

This free graphic calculator can also serve as a Scientific Calculator, has graphing capabilities, offers a unit converter, and can create a table of functions from values entered. It also has a set of references for formulas.

New app from Concord Consortium to help teach graph literacy

Great math activity with or without stories. Have students graph the story.

Use this app like "digital paper" to draw and create graphs that recognize hand-written mathematics with an underlying algebra system. 

"CCL4s provides an interface for entering observation data as well as access to all the Content Standards for Mathematics K-12 and the ISTE NETS.S. The collected observation data can be shared via email or with our unique built-in instant meeting. The graphs are very interactive and allow observers to merge different observations to compare and contrast different teachers or the same teacher over time. Using the Timeline feature, observers can track the observed Look-fors through time."

The app leverages the power of the online WolframAlpha search engine and also performs computations.