What are some free video editing software that is similar to Sony Vegas?

One time I tried to download Sony Vegas Pro for free but it turned out to be a trial version and didn't turn out the way I wanted it to be: free and easy to use.

So right now I'm looking for some good alternatives to Sony Vegas but with exactly the same tools and features. One example: I want to superimpose photos and videos over another and alter it many ways such as rotating it. I already use Windows Movie Maker (both WMM and Windows Live) but I want to download something like Sony Vegas but as freeware and not another trial version. And I can't afford to pay the costs of purchasing/using Sony Vegas.