Here’s a little collection of nice Matrix Algebra / Linear Algebra Demos that I found today:
1. From the Demos with Positive Impact site, a collection of Matrix Algebra Demos with voiceovers. These could be very nice lesson material for supplementing a hybrid/online course or for helping students who missed a day of class.

2. From Wolfram Demonstrations (remember you will need to download the Mathematica Player AND the demonstration in order to use and manipulate it)

3. Guess what? Gaming programmers need math. Amongst other things, they need to understand linear transformations! Want to prove it? Here is a website of “essential math” for programmers. Scroll down the page and you will find a powerpoint presentation on linear transformations and matrices.