Meograph is a free, easy multimedia storytelling tool. Students can quickly combine videos, audio, pictures, text, maps, timelines, and links to create what the developers call "four-dimensional storytelling." No registration is required and an education version is available. You have to play around with it to get the concept before introducing it to students.
A online story making resource where users choose, type, click and drag themselves a story with images and animation to share.
http://ictmagic.wikispaces.com/English