Atavist (formerly Creatavist)
LINK TO SITE
Atavist is a free site that enables you to create a reading experience to engage audiences. Tell stories with text, images, video, maps, and more. You're not limited to a platform or format—create a story, ebook, magazine, video narrative, report—and publish almost anywhere. This is a great digital storytelling tool. Be aware that the free version may host ads.