Everyone likes free software. It's even better when that software is actually good.
I want tell you about one Autodesk software that I've been using for a long time and really like. It's Autodesk Screencast, Screencast is a desktop recording application that allows you to record your screen and then share it with others. Now I know there are other screen recording applications out there but if you're in Autodesk software user you really should check out Screencast it works fantastic with Autodesk products giving you a button right inside software to start a recording. It records mouse movement, clicks, keystrokes and commands typed at the command line in AutoCAD. This is great for recording tips and tricks to share with coworkers or to illustrate issues for support.
Give Autodesk Screencast a try it won't cost you a dime and I think you'll like it.