011.video is a free online web editor very easy to use even for dummies. You can mix video, sound, voice, images, drawing and build an original video. It's really different from usual softwares. You don't need working hours with video timeline or transition effects to create your own video.
Great service to create short videos quickly. Easy to use. I especially like the option to convert web pages to videos, which I use for my work as a community manager in Italy.