Sway could be a PowerPoint killer, and oddly enough, the free presentation tool is from Microsoft.
Sway, currently in open preview and part of the Microsoft Office suite, makes it dead simple to create and share interactive presentations. When you create a new "Sway" you're presented with simple cards to add a title and your sections (kind of like slides).
You can pull in photos, videos, and other content directly from connected apps (including OneDrive, Facebook, YouTube, Bing and Twitter), and easily add a different layout to your creation. A "mood" feature lets you quickly format and adjust the style through templates. And when you're all done, the Sway is viewable online by anyone with the link.
Although there aren't many templates available yet, Sway promises to be a simpler alternative to PowerPoint. You can use it for family slideshows, school reports and quick presentations.