Upscribe - Embeddable lead generation forms for Medium
Marvel Embeds - Embed interactive prototypes on any site (including Medium!)
Contact Form - Make it easy to talk to your customers
Refined Medium - Chrome & Firefox extension that removes clutter on Medium
Tripetto - Visual editor and more - for self-hosted forms and surveys
InAppStory - Engage your customers with Stories right from your app or mobile web product with InAppStory.