What is the program that people use to make youtube videos where the camera follows the mouse?

I want to make some youtube videos on my computer (the kind where the camera follows the mouse), but i don't know what the software is to make those, any help?
Answer:

True, Camtasia is screen recording software that would allow you to make those follow-the-mouse YouTube videos. [Download here: http://download.cnet.com/Camtasia-Studio/3000-13633_4-10665109.html%5D However, as you'll see on the click-through, it goes for 300 dollars. Maybe you've got that kind of dough to blow--certainly not me. That's why, instead of Camtasia, I decided to download CamStudio [http://download.cnet.com/CamStudio/3000-13633_4-10067101.html?tag=mncol%5D. It'll cost you the very low price of zero dollars. Sure, with the low price comes a limited selection of formats, and it doesn't have a built-in video editor. But all I wanted was something that would record my screen to a video file--I've already got video conversion and editing software--and CamStudio does that solidly and reliably. Notably, you can record sound through your speakers while you're capturing, as well as highlight the mouse for easier viewing. Here's a Sony Vegas Pro tutorial I created using the freeware:

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