This is where I'll post or link to GeoGebra files. 

(More info on GeoGebra in this workshop: see What to Bring.)

Introduction to transformations
Complex numbers and matrices
Teacher's notes on these files.

In most of those files I use the convention: orange for the original (pre-image), indigo for the image.

To explore some other things I've done with GeoGebra, go to my Applets Directory.