TI-nspire and Geogebra both have powerful 3-D graphing technology. I do have to say, though, Geogebra is easier to utilize–mostly due to the fact that the mouse cursor on the TI-nspire is its own definition of sadness; it kind of feels like trying to drive a stick in the middle of a winter storm.
The 3-D graphing is quite impressive–so impressive that the whole time I’m using it, I am worried my computer or the TI-nspire is going to blow up any minute. Don’t get me wrong; that is a complement!
Throughout the 3-D graphing section, almost every part got me to think, “I wish I had these back in Calculus III”. I am sure many can agree that visualizing 3-dimensional space is pretty much half of Calculus III, which is why I believe having these technologies would make their our so much easier.
I still remember stressing over calculating area of 3-dimensional parallelogram, which took me 2 hours to figure out. In hindsight, it’s quite simple; you get an area of parallelogram using 2 vectors, and just multiply that by another vector (width). However, in Geogebra, you can literally create a 3-D parallelogram with few clicks, and 10 seconds is WAY better than 2 hours of misery.
These 3-D graphing softwares, I think, could be used for any multivariable calculus.
Hyogi's Blog 