We had created a series of free Widgets (Captivate Classic terminology - not related to widgets in Captivate). The Captivate Classic widget functionality was great, because it allowed us to create a custom UI and include JS to the published file. Our widgets are here: https://envolvemedia.com/custom-applications/#captivate

A simple example is the Save As Widget. The Captivate developer could use their own button instance that when clicked would just save the contents of that slide to a PDF or Image on the end-users machine.

Captivate [New] doesn't allow for these widgets. Even creating a "Custom Design" does not support setting custom parameters (e.g. think select PDF or Image) or include external JS files in the published output.

Ultimately, it would be great to support these Captivate Classic type widgets. At the least, please provide a way to include external JS files with published output, which may also require supporting custom publishing templates, too