First thing first, I have not used this software (I use Camtasia). For free software that works on Mac or PC, this is pretty powerful, and that have a fair amount of videos on their website. 

Cross-platform video editing software (Linux, Mac, and Windows)
Support for many video, audio, and image formats
Powerful curve-based Key frame animations
Desktop integration (drag and drop support)
Unlimited tracks / layers
Clip resizing, scaling, trimming, snapping, rotation, and cutting
Video transitions with real-time previews
Compositing, image overlays, watermarks
Title templates, title creation, sub-titles
3D animated titles (and effects)

Check it out at www.openshot.org

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