Online Graphing Calculators and Apps

Most U.S. students know about the Texas Instruments Graphing calculators! They are powerful and can do a lot of great stuff including graphing equations, work with matrices ,  perform statistical analysis and much more. Heck they can even work with complex numbers!  and the TI-89 is so powerful that many standardized tests do not allow test takers to use them--the 89 can do a lot of Calculus for you--take derivatives, use the power rule and much more. It's like Wolfram Alpha in a small box !

However, with the rise of the the internet most of these features can now be found online and usually for free! Here' s a list of the best resources that I know

Online Graphing Calculators

• Meta  Calculator - basically  a free virtual Texas instruments calculator 
• Archimy- great 3-d Graphs, even if user interface is a little bit rough around the edges
• Wolfram Alpha - Like a TI-89 on steroids! This baby can do pretty much anything that you might want!
• Google.com - Yes, Google.com can now graph equations! Just type sin(x) in the search bar and you'll see what I mean!

All three of these are very powerful , free. In the end, they can actually do more than your TI calculator at home can probably do!