video conversion

Hey, everyone, Recently, a few of my friends gave me a video they shot for a class project, (Yes, I'm still young enough to have to do class projects) which they've been trying to post to YouTube. The problem is, the video is 1.5 gigs... and is only 8 minutes long. I have no idea what they did...

Anybody know a good bit of software for my iMac (OSX) that will convert .wmv to .mov? I need something that's free, or will at least have a good long demo period so I can get them all done before I have to pay.