There is a wide variety of free and commercial tools to create HTML5 assets. A quick online search will provide a number of options that you can test for both personal preference and suitability for create HTML5 assets for Author-it. A few popular examples include:
- Tumult Hype
- Adobe Animate (or whatever it’s called)
Or, you may choose to handcode your HTML5 assets. Work with your Author-it users to test the outputs from different tools, following the recommendations below.