Which is the best “Freeware” video editing software that supports all kinds of formats i.e. rm, mp4, flv, dat?

Actually I basically need to just cut some video clips of different video formats.

You may take a look at this website, it collects many free video editing software, I’m sure you will find one you need.
http://www.freedvdripper.net/free-video-editor.html
Or you [...]