Multivariable Calculus - Textbook by George Cain and James Herod. Chapters in PDF. - http://www.math.gatech.edu/~cain/notes/calculus.html
Multivariable Calculus Examples - An interactive tutorial of multivariable calculus. A lot of work with graphics. Requires the use of DPG programming to participate in the examples. - http://www.dpgraph.com/MCExamples/MCExamples.html
Multivariate Calculus - Features problem sets for different topics. Includes a brief introduction to each topic. Uses pdf or dvi files. - http://www.swarthmore.edu/NatSci/smaurer1/Math18H/multivarH.html
Multivariable Calculus Problems - Various calculus problems are solved and plotted on a 3D graph. - http://www.ma.iup.edu/MathDept/Projects/CalcDEMma/veccalc/veccalc.html
Multivariable Calculus Applets - Features graphing gradients, parametric, and polar curves, matrix manipulation, and a tutorial on determinants. - http://www.math.ucla.edu/~ronmiech/crew/eugene/java/