InAppStory - Engage your customers with Stories right from your app or mobile web product with InAppStory.
Storyly - Bring superb stories to your app
Stories as a Service - Add stories to your website with 1 line of code
Zuck.js - JavaScript library that lets you add Stories everywhere
Storyheap - Manage your SnapChat and Instagram stories.
Storyteller - Storyteller's end-to-end platform gives you a best-in-class Stories experience in days with native SDKs, publishing tools, analytics, and ad support.