I first started looking for online presentation and animation tools when I got interested in blended learning. Looking for ways to give students access to information outside of class, I came across Powtoon. I still use the free version, although there are paid options which give you access to more features, templates and greater flexibility. With the free version you can still upload to YouTube, embed in your website, blog or wiki, download as a pdf or share your video on social media.
Some of the ways I have used this tool so far include: