Online Graphing with fooplot.com
 Fooplot is also great to graph if you understand TI writing. Go to Fooplot.com if you are in a hurry, just type in your browser an equation after fooplot .com Example: fooplot.com/sin(x) fooplot.com/x^2+2*x+1 and you will get the graph right away!
Graphing Calculators
 Here you have a graphing calculator provided by Holt: Holt Graphing Calculator
 Gcalc. A java Graphing calculator is found at http://gcalc.net/
 ??Mathopenref. Has a graphing calculator to graph up to three functions.
 Web Graphing offers a variety of free tools to graph for free!
Analyzemath Calculators

Check Analyzemath.com to see a variety of online calculators.
More for your TI84
 Zoom Math has a free program called App4Math that enables you to see and enter math problems just like they appear in your textbooks. Ready to install on your TI83 Plus.
 Inequality Graphing App for the TI83 Plus
Microsoft Graphing calculator
If you have MS Word download this graphing calculator in your computer for free!
More Online Graphing tools
 Create a Graph by the National Center for Education Statistics it is a good place to make a graph in just few minutes.
If you find any other online graphing calculator and want to include it here please contact me. Thanks!