Is there a good online graphing calculator/scientific calculator?

Good Ones

a.       http://www.coolmath.com/graphit/

                                                              i.      Easy to type in equation and graph it

                                                             ii.      Can graph infinitive amount of lines on one graph

1.       To re-graph a line one has to delete original from the graph and re-enter data

                                                            iii.      Show discontinuity

                                                           iv.      Easy to zoom in on a specific part of the graph by dragging a square.

                                                             v.      Downside with the zoom is it’s hard to zoom out. The easiest way is to reset the graph and re-graph.

                                                           vi.      Keeps a list of graphed equations on right hand side

                                                          vii.      The scientific calculator works well as long as you put in all appropriate parentheses.  Like any online calculator it can take a while to type out the data.

b.      http://rentcalculators.org/stheli.html

                                                               i.      Easy to enter, and can change color of line

                                                             ii.      Can add up to four equations, and all are displayed and can easily be changed and re-graphed. And the colors can be changed (Rainbow graphs!)

                                                            iii.      Can click on individual equations and click trace, it will show your  and give the coordinates of the y-intercept

                                                           iv.      Can set the window to whatever you want

                                                             v.      Shows a table which you can set yourself

                                                           vi.      Table shows discontinuity, but does not on the graph

                                                          vii.      Can plot points on the graph

                                                        viii.      Finds intersection point of two lines

c.       http://gcalc.net/ and http://www.calculateforfree.com/graph.html

                                                               i.      can graph more than one line but cannot change it after it’s graphed

                                                             ii.      has a trace feature

Not so Terrific Ones

d.      http://calculator.runiter.com/graphing-calculator/online-graphing-calculator.htm

                                                               i.      Found this one but it seems like it might have a virus.. wasn’t willing to find out

e.      http://www.algebrahelp.com/calculators/function/graphing/

                                                               i.      I tried this one, but it didn’t like my division sign “/” and couldn’t figure out what it wanted

Conclusion

I liked this one the best (b.) http://rentcalculators.org/stheli.html. It did almost everything I wanted except show discontinuities on the graph, but it did with the table. It was easy to use after using a TI-83+ all of these years; it had more features than any of the other ones that I looked at. I found all of these by 

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