Storyly - Bring superb stories to your app
Upscribe - Embeddable lead generation forms for Medium
InAppStory - Engage your customers with Stories right from your app or mobile web product with InAppStory.
Marvel Embeds - Embed interactive prototypes on any site (including Medium!)
Zuck.js - JavaScript library that lets you add Stories everywhere
Refined Medium - Chrome & Firefox extension that removes clutter on Medium