Want a powerful free video converter? MPEG Streamclip doesn’t care if you run OS X or Windows. It just converts and demuxes most any QuickTIme, DV, AVI or MPEG 1, 2, and 4 formats and output them into a QuickTime, DV, AVI or MPEG-4 so you can get it into your favorite editing software and get back to getting creative. (Hey, it's a basic video editor and does post processing features, too, but we love it mostly for being an incredibly useful tool for converting video from one format to another!)