Storyly - Bring superb stories to your app
Buffer Stories Creator - Quickly create thumb-stopping content for Stories
InAppStory - Engage your customers with Stories right from your app or mobile web product with InAppStory.
Mega Creator - Create graphics for any needs and tell your stories with visuals
Zuck.js - JavaScript library that lets you add Stories everywhere
Pablo - Pablo enables any user to create engaging images without sign-in and design experience.