from Math Insight
This link connects you to a marvelous display of demonstrations and computational experiments involving vectors in multiple dimensions. I like the 3D views of vectors and how they can be simplified for understanding their underpinnings by an appropriate point of view.
The entire list of examples from the Math Insight website can be found Here
Math Insight
Vector Fields in Two Dimensions 1

Math Insight
Vector Fields in Two Dimensions 2

Math Insight
Vector Fields in Two Dimensions 3

Math Insight
Vector Fields in Two Dimensions 4

Math Insight
Vector Fields in Three Dimensions 1

Math Insight
Vector Fields in Three Dimensions 2

Vector Field Online Graphing
KevinMehall.net/

Computational Vector Analysis Topics
USMAthematics

Line Integrals
USMAthematics
