Does anyone know any good Movie/Clip editors?

[PoosKi]

So recently I've been wanting to make some frag movies of my awesome clips that I hit in game, I got my hard drive recently (1.0TB Western Digital Black if you actually care) and am just waiting to start editing. This leads me on to the question of...

Does anyone know any good clip editors (preferably free.)

Thanks! (I wanna make good movies and stuff like Ownaj) 

rawr