Actually, you don't need any "specific software" to download and transfer your vid files.
You can either just connect your AC to your PC, and transfer them that way, or you can remover the card from the bird, toss it into your PC and copy them over that way, and then you can burn a disk..
It's the "post processing" software that is the decision....
I use Adobe Premeir Pro/CS3..
There are freeware version out there, DaVinci pops into my little bwain...
But here are some more options, and others here can chime in on these options: