My brother uses audacity or something. I do not really know you can look it up and try it. I am pretty sure it is free and downloadable.
There are several on this page that are free. Audacity is available at sourceforge.net for free but if all you want is a simple recorder it's a bit of overkill. You might look at the Megamind recorder hee as it is feature rich but also uncomplicated and intuitive. Good luck.
I use MixPad Audio Mixer. It's free and extremely easy to figure out. :)Where to download MP4s for free?